The GCF is 1.
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The least common multiple of 20 , 13 = 260
The least common multiple of 13 and 20 is 260.
The least common multiple of 5, 13, 20, and 26 is 260.
The Least Common Multiple of 5 and 20 is 20.
The Greatest Common Factor (GCF) of 13 and 20 is: 1