There are 6 factor pairs of 726:
726 = 1 x 726
726 = 2 x 363
726 = 3 x 242
726 = 6 x 121
726 = 11 x 66
726 = 22 x 33
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726 363,2 121,3,2 11,11,3,2
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 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)