There are six factor pairs:
392 = 1 x 392
392 = 2 x 196
392 = 4 x 98
392 = 7 x 56
392 = 8 x 49
392 = 14 x 28
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The factor pairs of 57 are 3x19 and 1x57
The factor pairs of 343 are (343,1) and (49,7)
20 has 3 factor pairs. Pairs are (1,20), (2,10) and (9,9)
The greatest common factor (GCF) is 98.
The factor pairs of 12 are (12,1), (6,2), and (4,3) The factor pairs of 18 are (18,1), (9,2), and (6,3)