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It is not possible to give a sensible answer to this question. The greatest common divisor (GCD) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!

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You need at least two numbers to find a GCF.

Q: What is the greatest common divisor of 20?

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Greatest Common Divisor (GCD) for 12 20 is 4.

Greatest Common Divisor (GCD) for 20 28 is 4.

The Greatest Common Divisor of 220, 400 is 20.

The Greatest Common Divisor (GCD) for 80 and 4,900 is 20

No. The greatest common divisor for 15 and 20 is five. Five is a prime number.

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Greatest Common Divisor (GCD) for 20 28 is 4.

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The greatest common multiple is an infinite amount and not very practical for problem solving.

Greatest Common Divisor (GCD) for 12 20 is 4.

The Greatest Common Divisor of 120, 500 is 20.

The Greatest Common Divisor of 220, 400 is 20.