67 and 1/5
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It is a composite number.
1234678121416212428324248568496112168224336672
Yes, 672.
There are infinitely many pairs. Pick any non-zero number, X and let Y = 672/X. Then X*Y = X*(672/X) = 672. And, since the choice of X was arbitrary, then there are infinitely many such pairs. There are also infinitely many sets of 3, 4 5, ... numbers which will multiply to 672.
20 percent of 672 = 134.420% of 672= 20% * 672= 20%/100% * 672= 1344/10= 672/5 or 134.4