2 and 5
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Any multiple of 20 includes the prime factors of 20.
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.
The prime factors of 20 are: 2 and 5.
The prime factors of 20 are 2, 2, and 5.
The prime factors of 20 are 2 and 5. The prime factors of 30 are 2, 3 and 5.