Factors of 20: 1, 2, 4, 5, 10, 20.
Factors of 63: 1, 3, 7, 9, 21, 63.
GCF (20, 63) = 1
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The GCF is 34.
The Greatest Common Factor of 80, 52, 60: 4
The Greatest Common Factor (GCF) is: 10
The greatest common factor of 54 and 80 is 2.
The greatest common factor between 55 and 80 is 5.