The factors of 18 are 1, 2, 3, 6, 9 and 18. That is 6 factors in total.
A factor of 18 is a whole number that divides 18 exactly, with no remainder. 18 is a composite number because it has factors other than 1 and itself.
Two numbers that multiply to give 18:
18 = 2 × 3 × 3 = 2 × 3². The prime factors of 18 are 2 and 3.
| Number | Factors |
|---|---|
| 14 | 1, 2, 7, 14 |
| 15 | 1, 3, 5, 15 |
| 16 | 1, 2, 4, 8, 16 |
| 17 | 1, 17 |
| 19 | 1, 19 |
| 20 | 1, 2, 4, 5, 10, 20 |
| 21 | 1, 3, 7, 21 |
| 22 | 1, 2, 11, 22 |
More about 18: 18 squared · square root of 18 · 18 in binary · 18 in Roman numerals.
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