The factor pairs of 1980 are 1 and 1980, 2 and 990, 3 and 660, 4 and 495, 5 and 396, 6 and 330, 9 and 220, 10 and 198, 11 and 180, 12 and 165, 15 and 132, 18 and 110, 20 and 99, 22 and 90, 30 and 66, 33 and 60, 36 and 55, 44 and 45
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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 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)
The factor pairs of 111 are 1x111, 11x10. These are in order.