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The numbers are: 1 and 20
21 and 1
-21 and -1
84
21 and 28 are the two multiples.
21
Their product.
41
They are 21 and 28
The factor pairs of 21 are (21, 1) (7, 3) Even considering their negative counterparts, they don't add up to -13.
-20
-21