The GCF of those numbers is 4. If 20 disappeared, the GCF of the remaining numbers would be 8.
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gcf (greatest common factor) is usually calculated for two (or more) numbers, not for a single number.
The pair of numbers 16 and 160 has a GCF of 16 and an LCM of 160.
16, 32 and 48
32 and 48
How about 16 and 24