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There is neither a greatest common factor nor common factors of a single number, such as 19, because there cannot be any form of common factor without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. The greatest common factor is the largest factor that all the numbers being compared have in common. Thus, since there are not two or more numbers to compare, there are neither common factors nor a greatest common factor.
The factors of 19 are 1 and 19.
The prime factor of 19 is 19.
Examples:
The common factors of 19 and 52 are only 1; the greatest common factor is 1.
The common factors of 19 and 95 are 1 and 19; the greatest common factor is 19.
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