All factors are whole numbers and all whole numbers are rational numbers (a rational number is one which can be expressed as one integer over another integer, and whole numbers can be expressed as themselves over 1), thus all factors are rational numbers and so all greatest common factors are rational numbers.
The set of whole numbers is a [proper] subset of the set of rational numbers: ℤ ⊂ ℚ
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The greatest common factor of 12 and 20 is 4
The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question! The greatest factor of any number is itself.
There is no Greatest Common Factor (GCF) for a single number. The Greatest Common Factor (GCF) is the largest factor common to two or more given numbers.
the smaller number
The greatest common factor of 60 and 70 is 10