There are 4 factor pairs of 40.
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Between 35 and 40, 36 has the most factor pairs.
(40,1)(20,2)(10,4)(8,5)
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)