10,20,30,40,50,60,70,80,90
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∙ 8y agoFour numbers less than thirty, 12, 18, 20, and 28, each have exactly 6 factors.
Prime numbers
there are 3 no.2,3 & 5
14 (I think).
There are a few numbers that are less than 19 and have more than 4 factors. The number 10 is less than 19 and has more than four factors.
Four numbers less than thirty, 12, 18, 20, and 28, each have exactly 6 factors.
11
They are: 2 3 5 and 7 all of which are prime numbers
Prime numbers
Just 36.
there are 3 no.2,3 & 5
14 (I think).
Perfect squares have an odd number of factors. There are 31 perfect squares less than 1000.
They all are prime numbers except 1
All but the square numbers - 53 of them.
There are a few numbers that are less than 19 and have more than 4 factors. The number 10 is less than 19 and has more than four factors.
99, but that's probably not what you want to know. There are 21 factors of 360 that are less than 100.