Tap a number to see all its factors, factor pairs, prime factorization and whether it is prime. For any other number use the prime number checker or the GCF and LCM calculator.
Factors of 1 · Factors of 2 · Factors of 3 · Factors of 4 · Factors of 5 · Factors of 6 · Factors of 7 · Factors of 8 · Factors of 9 · Factors of 10 · Factors of 11 · Factors of 12 · Factors of 13 · Factors of 14 · Factors of 15 · Factors of 16 · Factors of 17 · Factors of 18 · Factors of 19 · Factors of 20 · Factors of 21 · Factors of 22 · Factors of 23 · Factors of 24 · Factors of 25 · Factors of 26 · Factors of 27 · Factors of 28 · Factors of 29 · Factors of 30 · Factors of 31 · Factors of 32 · Factors of 33 · Factors of 34 · Factors of 35 · Factors of 36 · Factors of 37 · Factors of 38 · Factors of 39 · Factors of 40 · Factors of 41 · Factors of 42 · Factors of 43 · Factors of 44 · Factors of 45 · Factors of 46 · Factors of 47 · Factors of 48 · Factors of 49 · Factors of 50 · Factors of 51 · Factors of 52 · Factors of 53 · Factors of 54 · Factors of 55 · Factors of 56 · Factors of 57 · Factors of 58 · Factors of 59 · Factors of 60 · Factors of 61 · Factors of 62 · Factors of 63 · Factors of 64 · Factors of 65 · Factors of 66 · Factors of 67 · Factors of 68 · Factors of 69 · Factors of 70 · Factors of 71 · Factors of 72 · Factors of 73 · Factors of 74 · Factors of 75 · Factors of 76 · Factors of 77 · Factors of 78 · Factors of 79 · Factors of 80 · Factors of 81 · Factors of 82 · Factors of 83 · Factors of 84 · Factors of 85 · Factors of 86 · Factors of 87 · Factors of 88 · Factors of 89 · Factors of 90 · Factors of 91 · Factors of 92 · Factors of 93 · Factors of 94 · Factors of 95 · Factors of 96 · Factors of 97 · Factors of 98 · Factors of 99 · Factors of 100
Factors of 101 · Factors of 102 · Factors of 103 · Factors of 104 · Factors of 105 · Factors of 106 · Factors of 107 · Factors of 108 · Factors of 109 · Factors of 110 · Factors of 111 · Factors of 112 · Factors of 113 · Factors of 114 · Factors of 115 · Factors of 116 · Factors of 117 · Factors of 118 · Factors of 119 · Factors of 120 · Factors of 121 · Factors of 122 · Factors of 123 · Factors of 124 · Factors of 125 · Factors of 126 · Factors of 127 · Factors of 128 · Factors of 129 · Factors of 130 · Factors of 131 · Factors of 132 · Factors of 133 · Factors of 134 · Factors of 135 · Factors of 136 · Factors of 137 · Factors of 138 · Factors of 139 · Factors of 140 · Factors of 141 · Factors of 142 · Factors of 143 · Factors of 144 · Factors of 145 · Factors of 146 · Factors of 147 · Factors of 148 · Factors of 149 · Factors of 150 · Factors of 151 · Factors of 152 · Factors of 153 · Factors of 154 · Factors of 155 · Factors of 156 · Factors of 157 · Factors of 158 · Factors of 159 · Factors of 160 · Factors of 161 · Factors of 162 · Factors of 163 · Factors of 164 · Factors of 165 · Factors of 166 · Factors of 167 · Factors of 168 · Factors of 169 · Factors of 170 · Factors of 171 · Factors of 172 · Factors of 173 · Factors of 174 · Factors of 175 · Factors of 176 · Factors of 177 · Factors of 178 · Factors of 179 · Factors of 180 · Factors of 181 · Factors of 182 · Factors of 183 · Factors of 184 · Factors of 185 · Factors of 186 · Factors of 187 · Factors of 188 · Factors of 189 · Factors of 190 · Factors of 191 · Factors of 192 · Factors of 193 · Factors of 194 · Factors of 195 · Factors of 196 · Factors of 197 · Factors of 198 · Factors of 199 · Factors of 200
Factors of 225 · Factors of 240 · Factors of 250 · Factors of 256 · Factors of 300 · Factors of 320 · Factors of 360 · Factors of 400 · Factors of 500 · Factors of 600 · Factors of 720 · Factors of 1000
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199
See also: list of prime numbers and "is it prime?" answers.
Two numbers? See the GCF and LCM of common pairs.