Factor Calculator
Find factors and a prime factorization for a positive integer.
Find factors
Enter a positive integer to inspect its prime factorization. A factor divides the original number with no remainder. The result can be used to reason about greatest common factors, least common multiples, and fraction reduction.
Prime factorization
Divide the number by the smallest possible prime, continue dividing the quotient, and stop when the remaining value is prime. The product of the listed primes equals the original integer.
Worked example
84 factors as 2 × 2 × 3 × 7. The factorization can also be written as 2² × 3 × 7.
Frequently asked questions
Frequently Asked Questions About Online Calculators
Can I enter a decimal?
No. Use a positive integer for prime factorization.
Is 1 a prime number?
No. One is a special positive integer with one factor, itself.
Can I use this to reduce fractions?
Yes. Factorization can help find a greatest common factor, then apply that factor to the numerator and denominator.