The factor pairs of 29 are 1 and 29. 29 is prime so it has only one factor pair.
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There are 2 factor pairs of 87:87 = 1 x 8787 = 3 x 29
The factors of 203 are 1, 7, 29, and 203. The factor pairs of 203 are (1, 203) and (7, 29).
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)