Factors of 15
15 has 4 factors.
All factors of 15
1, 3, 5, 15
Prime factorization: 3 × 5
Number of factors
4
Sum of factors
24
Prime?
No
Factor pairs of 15
Each pair multiplies together to make 15:
| Pair | Product |
|---|---|
| 1 × 15 | 15 |
| 3 × 5 | 15 |
Factors of nearby numbers
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Frequently asked questions
What are the factors of 15?+
The factors of 15 are 1, 3, 5, 15 — that is 4 factors in total.
What is the prime factorization of 15?+
The prime factorization of 15 is 3 × 5.
Is 15 a prime number?+
No. 15 has 4 factors, more than just 1 and itself, so it is a composite number.