Factors of 16
There are 5 factors of 16 — the full list is below, with factor pairs, prime factorization, and divisibility notes.
Factors of 16
1, 2, 4, 8, 16
Factor pairs of 16
- 1 × 16
- 2 × 8
- 4 × 4
Prime factorization of 16
16 = 2⁴
Number facts
- 16 is a composite number.
- 16 has 5 factors.
- 16 is a perfect square.
- The sum of all factors of 16 is 31.
Divisibility rules that apply to 16
- 16 is divisible by 2 because it ends in an even digit (0, 2, 4, 6, or 8).
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How the factors of 16 are calculated
To find the factors of 16, every whole number from 1 up to the square root of 16(about 4.00) is tested for even division. 16 is even, and it divides evenly by 2, 4, 8. Written as a product of primes, 16 = 2⁴. 16 is also a perfect square, which is why one of its factor pairs is a number multiplied by itself.
Frequently asked questions about 16
How many factors does 16 have?
16 has 5 factors: 1, 2, 4, 8, 16.
Is 16 a prime number?
No. 16 is composite because it has factors other than 1 and itself.
What are the factor pairs of 16?
The factor pairs of 16 are 1 × 16, 2 × 8, 4 × 4.
What is the prime factorization of 16?
The prime factorization of 16 is 2⁴.