Factors of 20

The factors of 20 are 1, 2, 4, 5, 10 and 20. That is 6 factors in total.

A factor of 20 is a whole number that divides 20 exactly, with no remainder. 20 is a composite number because it has factors other than 1 and itself.

Factor pairs of 20

Two numbers that multiply to give 20:

1 × 20 = 20
2 × 10 = 20
4 × 5 = 20

Prime factorization of 20

20 = 2 × 2 × 5 = 2² × 5. The prime factors of 20 are 2 and 5.

Quick facts about 20

Is 20 prime? No.
Even or odd: even.
Sum of its factors: 1 + 2 + 4 + 5 + 10 + 20 = 42.

Factors of nearby numbers

Number	Factors
16	1, 2, 4, 8, 16
17	1, 17
18	1, 2, 3, 6, 9, 18
19	1, 19
21	1, 3, 7, 21
22	1, 2, 11, 22
23	1, 23
24	1, 2, 3, 4, 6, 8, 12, 24

More about 20: 20 squared · square root of 20 · 20 in binary · 20 in Roman numerals.

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