The GCF is 1.
The GCF for 20 and 27 is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
3
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 27.
GCF for 16 & 27 = 1Prime factorization of:16 = 2 * 2 * 2 * 227 = .................3 * 3 * 3=================GCF = 1 (since the twonumbers haveno common factor except 1)