You need at least two numbers to find a GCF.
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A single number cannot have a greatest common divisor, or greatest common factor. Greatest common factors are used to compare two or more numbers.
Greatest Common Divisor (GCD) for 20 28 is 4.
The Greatest Common Divisor of 56, 84 is 28.
The Greatest Common Divisor of 420 and 476 is 28.
the greatest common divisor or factor is 11
The Greatest Common Divisor is 6