A factor of a number is any number which the original number can divide into evenly. That is to say, can divide into without leaving a remainder, decimal or fraction.
The factors of 15 are:
1, 3, 5 and 15
The factors of 20 are:
1, 2, 4, 5, 10 and 20.
The factors of 35 are:
1, 5, 7 and 35.
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