All common factors

The common factors of two or more numbers are the positive integers that divide evenly into those numbers.

For example, the common factors of 12 and 18 are 1, 2, 3, and 6.

To find all the common factors of two or more numbers, you can list the factors of each number and then identify the ones that appear on all the lists.

For example, to find all the common factors of 12, 18, and 24:

The factors of 12 are 1, 2, 3, 4, 6, and 12.
The factors of 18 are 1, 2, 3, 6, 9, and 18.
The factors of 24 are 1, 2, 3, 4, 6, 8, 12, and 24.

From these lists of factors, the common factors are 1, 2, 3, 6, and 12.