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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6the denominators of 162 are1,1622,813,546,279,18the denominators of 240 are1,2402,1203,804,605,486,408,3010,2412,2015,16
The GCF is 80.
The GCF is 20.
The GCF is 24.
The GCF is 48.