Factors of 18
18 has 6 factors.
All factors of 18
1, 2, 3, 6, 9, 18
Prime factorization: 2 × 3²
Number of factors
6
Sum of factors
39
Prime?
No
Factor pairs of 18
Each pair multiplies together to make 18:
| Pair | Product |
|---|---|
| 1 × 18 | 18 |
| 2 × 9 | 18 |
| 3 × 6 | 18 |
Factors of nearby numbers
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Frequently asked questions
What are the factors of 18?+
The factors of 18 are 1, 2, 3, 6, 9, 18 — that is 6 factors in total.
What is the prime factorization of 18?+
The prime factorization of 18 is 2 × 3².
Is 18 a prime number?+
No. 18 has 6 factors, more than just 1 and itself, so it is a composite number.