The GCF is 4.
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20 =4x5 24= 4x6gcf = 4
If you are talking of 20 and 24 then factor both to prime factors. 20=2x2x5 24=2x2x2x3 circle the common ones. 2x2=4 the greatest common factor.
The greatest common factor of 20, 24 and 28 is 4.
The greatest common factor (GCF) is: 6.
Greatest common factor of 6 24 and 33 is 3.