5 and 4 because -5-4 = -9 and -4*-5 = 20
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The HCF of the given two numbers is 9
One. The two numbers are coprime.
The GCF of 9 and 20 is 1
Only 1 goes in to 9 and 11 as a whole number. Technically any number can go into any number.
The number is 1.