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You have to have TWO or more numbers to answer that.

The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.
You need at least two numbers to find a GCF.

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Q: What is the greatest common factor of 19?
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