1, 2, 3, 4, 6, 8, 12, 24
Pick two.
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The common factors are: 1, 5
The factors are themselves and one because they are both prime numbers
1 and 2 are factors common to both numbers
Common factors have to go into both numbers. The only common factor of 20 and 27 is 1.
1, 2, 4, 8