Because the numbers being asked about are consecutive even numbers.
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The GCF (greatest common factor) would be 21.
13 is a prime number & 27 = 3*3*3*1, so the greatest common factor of 13 and 27 would be 1, which is the only common factor.
20 - 1,2,4,5,10,20 You can not have a GCF of just one number. But written are the factors of 20.
The greatest common factor would be 14 because 7 times 2 = 14 and 2x7=14 The GCF= 14
It is: 4