There is not enough information to answer this question.
Common factors are factors that two or more numbers have in common. Without being given at least two numbers, it is impossible to list all the common factors.
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All non-zero whole numbers can be common factors under the right circumstances. That makes the answer infinite and difficult to write down.
Since 9 is a factor of 63, all of its factors are common.
All numbers have a common factor of 1. Sometimes that's the only common factor.
Since 5 is a factor of 20, all the factors of 5 are common to 20.
Do you mean all the factors? I'm not sure what "common factors" is?
The only factor that's common to all of them is '1'.