Factors of 15

The factors of 15 are 1, 3, 5 and 15. That is 4 factors in total.

A factor of 15 is a whole number that divides 15 exactly, with no remainder. 15 is a composite number because it has factors other than 1 and itself.

Factor pairs of 15

Two numbers that multiply to give 15:

1 × 15 = 15
3 × 5 = 15

Prime factorization of 15

15 = 3 × 5. The prime factors of 15 are 3 and 5.

Quick facts about 15

Is 15 prime? No.
Even or odd: odd.
Sum of its factors: 1 + 3 + 5 + 15 = 24.

Factors of nearby numbers

Number	Factors
11	1, 11
12	1, 2, 3, 4, 6, 12
13	1, 13
14	1, 2, 7, 14
16	1, 2, 4, 8, 16
17	1, 17
18	1, 2, 3, 6, 9, 18
19	1, 19

More about 15: 15 squared · square root of 15 · 15 in binary · 15 in Roman numerals.

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