It depends on the number it is compared to.
20 is a multiple of 10.
20 is a factor of 40.
20 is both a factor and a multiple of itself.
20 is neither a multiple nor a factor of 27.
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Any multiple of 20.
No, 4 is a factor of 20.
20 is a factor of 180 180 is a multiple of 20
No, 5 is a factor of 10 and 20. 10 and 20 are multiples of 5.
The greatest common factor is 2 and the least common multiple is also 2.