A single number cannot have a greatest common factor because "common" refers to factors that two or more numbers have in common. You have only one number.
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the greatest common factor of 20 and 100 is:20
The greatest common factor (GCF) of 20 and 30 is 10.
The greatest common factor of 20 and 26 is 2
The greatest common factor of 20 and 32 is 4.
The greatest common factor would have to be 20.