well.
1 11
1 2 4 5 10 20
so the GCF is 1
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The Greatest Common Factor (GCF) of 20 and 36 is: 4
The greatest common factor of 20, 55, and 65 is 5.
There are no common factors between these values since 11 is prime and 20 is composite. Then, there are no common prime factors between these values.
80
20