They are:
1600 = 1 x 1600
1600 = 2 x 800
1600 = 4 x 400
1600 = 5 x 320
1600 = 8 x 200
1600 = 10 x 160
1600 = 16 x 100
1600 = 20 x 80
1600 = 25 x 64
1600 = 32 x 50
1600 = 40 x 40
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The factor pairs of 1600 are (1600,1)(800,2)(400,4)(320,5)(200,8)(160,10)(100,16)(80,20)(64,25)(50,32)(40,40) None of them add up to 60. If that was -1600, you could use 80 and -20.
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)