39
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8 and 5
1 and 40, 2 and 20 others include: 4 and 10 5 and 8 so there aren't just two, their are four pairs of integers whose product is 40.
The next odd integer after 40 is 41
40 is an integer: there can be no proper fraction for any integer other than 0.
40 is an integer, not a fraction.