36. (Factors are 1, 2, 3, 4, 6, 9, 12, 18 and 36.)
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It is 36.
The only number less than 100 with exactly nine factors is 36. 19 is not one of the factors.
48 does.
That depends what number you are trying to find the factors of - all those three numbers are factors of the number 18.
One through nine all have single digit factors.