16 breaks down into four prime factors, 2 x 2 x 2 x 2.
Regarding factors in general and assuming the four factors include one and the number itself, which are factors of every number, the numbers are...
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There is an infinite number of numbers between 0 and 20.
There are 19 numbers between zero and 365 that have an odd number of factors.
It is 10 whose factors are: 1, 2, 5 and 10
20 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
20 number