Four of them.
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There are 8 different pairs of whole numbers whose prodcut is 40. Allowing for commutativity (a*b = b*a), there are 16 possible ways.
10x5 and 1x50
There are 10 whole numbers in 10 to 19.
Four: 1 5 31 and 155.
650 has many different factories. Two such factors are 65 and 10.