The GCF of 20 and 66 is 2.
The prime factorization of 20 is 2*2*2
The prime factorization of 66 is 2*3*11
Their only common factor is 2, so it is their GCF.
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The greatest common factor of 66 , 132 = 66
The greatest common factor of 42 and 66 is 6.6
The greatest common factor of 66 and 153 is 3.
The Greatest Common Factor of 34 and 66 is 2.
The greatest common factor of 70 , 66 = 2