Factors of 19
There are 2 factors of 19 — the full list is below, with factor pairs, prime factorization, and divisibility notes.
Factors of 19
1, 19
Factor pairs of 19
- 1 × 19
Prime factorization of 19
19 = 19
Number facts
- 19 is a prime number.
- 19 has 2 factors.
- 19 is not a perfect square.
- The sum of all factors of 19 is 20.
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How the factors of 19 are calculated
To find the factors of 19, every whole number from 1 up to the square root of 19(about 4.36) is tested for even division. 19 is odd, and it turns out to be prime — no whole number other than 1 and 19 itself divides it evenly. Written as a product of primes, 19 = 19.
Frequently asked questions about 19
How many factors does 19 have?
19 has 2 factors: 1, 19.
Is 19 a prime number?
Yes. 19 is prime because its only factors are 1 and 19 itself.
What are the factor pairs of 19?
The factor pairs of 19 are 1 × 19.
What is the prime factorization of 19?
The prime factorization of 19 is 19.