The factors of 20 are 1,2,4,5,10 and 20. For them to be common, they need to be compared to another set of factors. There cannot be a common factor 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.
The factorsof 20 are 1, 2, 4, 5, 10, 20. For them to be common, they need to be compared to another set of factors.
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The common factors of 18 and 20 are 1 and 2.
The common factors of 20 and 60 are: 1, 2, 4, 5, 10, and 20 The common factors of 20 and 60 are: 1, 2, 4, 5, 10, and 20.
Common factors of 20 and 28: 1, 2, and 4.
Common factors of 20, 25, and 40 are: 1 and 5.
The common factors of 20 and 35 are: 1 and 5The factors of 20 are: 1, 2, 4, 5, 10, 20The factors of 35 are: 1, 5, 7, 35The common factors are: 1, 5