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Both 1 and 2 are factors of 16, but not multiples of 4.
4
A factor of 20 is a number that divides evenly into 20 without leaving a remainder. The factors of 20 are 1, 2, 4, 5, 10, and 20. Among these, the number 5 is a factor of 20 but not a multiple of 4 because it does not result from multiplying 4 by any integer.
1, 2, 5, 10
4, 12, 20, 60