Q:
# 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 Is the Difference Between a Factor and a Multiple?

A: The factors of a number are all the integers that can be multiplied together to produce that number. For example, 1, 2, 3 and 6 are all factors of 6. Multi... Full Answer >Filed Under: -
Q:
## What Are the Factors of 30?

A: The factors of 30 are 1, 2, 3, 5, 6, 10, 15 and 30. A number is considered the factor of another number when it can be evenly divided into that number. Full Answer >Filed Under: -
Q:
## What Are the Factors of 31?

A: The factors of 31 are 31,1,-1, and -31. For any number, x, the factors are the set of numbers that can be multiplied by another number to equal x. Full Answer >Filed Under: -
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## What Is the Sum of All the Positive Integer Factors of 12?

A: The sum of all the positive integer factors of 12 is 28. The positive integer factors of 12 are 1, 2, 3, 4, 6 and 12, and when added together, these terms ... Full Answer >Filed Under: