The LCF (Lowest Common Factor - the lowest number that divides both) is 1.
I guess you mean either:
The HCF is also called the GCF - Greatest Common Factor.
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36
The least common factor of any two integers MUST be 1.
36/60 = 12/20 = 6/10 = 3/5
1, 9, 36, 84, 126, 126, 84, 36, 9, 1
1 9 36 84 126 126 84 36 9 1