The factor pairs of 250 are:
1 x 250
2 x 125
5 x 50
10 x 25
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250 = 1*250, 2*125, 5*50, 10*25
1 and 500, 2 and 250, 4 and 125, 5 and 100, 10 and 50, 20 and 25, a total of 6 factor pairs.
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)