You need at least two numbers to find a GCF. If that's 3991 and 6800, the GCF is 1.
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The greatest common factor of 12 and 20 is 4
The Greatest Common Factor (GCF) is: 8
The greatest common factor is 2
The greatest factor of 99 is itself, which is 99. The greatest factor of any integer is the integer itself.
The greatest common factor of 30 and 39 is 3.