The GCF is 16.
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16
16
These numbers are co-prime so there is no common factor above 1.
The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.The greatest common factor of 20, 82, and 80 is 2.
The LCM is: 128