Factor out each term to get:
20 = 2² x 5
99 = 3 x 33
= 3² x 11
Since these terms don't have the common factor, the common factor is 1.
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The GCF is 99.
The greatest common factor of 4 and 99 is 1.
The GCF of 75 and 99 is 3.
A common factor of 99 and 108 is 3.
3 is the greatest common factor of 42 and 99.