(Every counting number) plus (a zero tacked on to the end of it) is one of them.
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Leaving out non-positive multiples, the answer is 5, 10, 15 and 20.
There are only three positive integer factors of 4. Perhaps you meant multiples, of which there are an infinite number.
500 contains 50 multiples of 10.
18,36,54,72,90
list the first 10 multiples of 15