There is neither a greatest common factor nor common factors of a single number, such as 39, 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.
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The greatest common factor of 39 and 18 is definitely 3.
The greatest common factor of 30 and 39 is 3.
The greatest common factor of 90 and 39 is 3
The greatest common factor of 22 and 39 is 1
Greatest common factor of 39 and 104 is 13.