There cannot be a greatest common factor (GCF) of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
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The factors of 36 are 1,2,3,4,6,9,12,18,and 36.The factors of 74 are 1,2,and 37.The greatest common factor of 36 and 74 is 2.
The Greatest Common Factor (GCF) of 20 and 36 is: 4
The greatest common factor is 3
It is: 4
The GCF is 12.