1 and 14, 2 and 7
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These are the 16 factor pairs for the number 1,080:1080,1540,2360,3270,4216,5180,6135,8120,9108,1090,1272,1560,1854,2045,2440,2736,30
The factor pairs of 21 are:1, 213, 7Therefore, the number 21 has two pairs of positive integer factors.
All of the composite numbers less than 100 have factor pairs.
There are 3 factor pairs of 28. 28 = 1 x 28 28 = 2 x 14 28 = 4 x 7
One divides any number