1,3,5,7,9,11,13,15,17,19
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'5' & '15' are odd numbers less than 20 , and are also multiples of '5'.
It is 9
Well, darling, the number you're looking for is 15. It's less than 20, odd, and can be broken down into the prime factors 3 and 5. So, there you have it, a prime factor party with the number 15 strutting its stuff.
Four of them.
4 x 5