1, 2, 4, 8
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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.
Factors of 64... 1,2,4,8,16,32,64 Factors of 66... 1,2,3,6,11,22,33,66 Common factors to both numbers.... 1 & 2.
Common factors of both numbers are: 1, 2, 4 and 8