There are infinitely many pairs: the simplest pair is 1 and 270
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(270,1)(135,2)(90,3)(54,5)(45,6)(30,9)(27,10)(18,15)
The greatest common factor of 270 and 360 is 90.
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)