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# What are proper factors?

**Proper factors are factors of a number N that are neither N nor 1.** In general, a factor of N is a whole number, or integer, that divides N without a remainder.

For example, the factors of 20 are 1, 2, 4, 5, 10 and 20. The proper factors of 20 are 2, 4, 5 and 10. Usually, when factoring a number, it is desirable to report only the prime factors, or factors that are also prime numbers. The prime factorization of 20 excludes 4 and 10, because both of these numbers are divisible by 2, and 10 is also divisible by 5.

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Q:
## What are the factors of 9?

A: The factors of 9 are 1, 3 and 9. A factor is a number that divides into another number evenly. When a person divides 9 by the numbers 9, 3 and 1, it is eas... Full Answer >Filed Under: -
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## What is the prime factorization of 24?

A: The prime factorization of 24 is 2 x 2 x 2 x 3. Thus, the number 24 has only 2 prime factors, 2 and 3. Prime factors of 24 are numbers that divide 24 exact... Full Answer >Filed Under: -
Q:
## What is a cube root formula?

A: To find the cube root of a number, find all of the number’s prime factors. A cube root is a number that, when cubed, gives the original number. If there ar... Full Answer >Filed Under: -
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## How do you factor polynomials with four terms?

A: A four-term polynomial is most often factored by grouping, a process where terms that have common factors are grouped and factored separately. In some case... Full Answer >Filed Under: