1 is the greatest common divisor of seven and two.
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The GCF is 7.
7
The prime factors of 20 are 2, 2 and 5 The prime factors of 35 are 5 and 7 Therefore the greatest (and, other than 1, the only) common divisor of 20 and 35 is 5.
It is: 7
Greatest Common Divisor (GCD) for 105 56 is 7.