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A single number cannot have a greatest common factor because "common" refers to factors that two or more numbers have in common. You have only one number.

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15y ago
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8y ago

You need at least two numbers to find a GCF.

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13y ago

GCF can be found only if we have 2 or more numbers. So we cannot find the GCF of 20 alone

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Q: What is the greatest common factor of 20?
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