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4 and 9.

Factors of numbers come in pairs which means that every number ought to have an even number of factors.

To have an odd number of factors, one factor pair must be a repeated number which means that only square numbers have an odd number of factors.

The square numbers less than 20 are 1, 4, 9 & 16 and of these 4 & 9 have 3 factors:

4: 1, 2 & 4

9: 1, 3 & 9

Q: What is a number less than 20 and has 3 factors?

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"12" has 6 factors.

They are 1, 2, 7 and 14.

Any number that has factors smaller than itself (other than 1) is a composite number.Any number that has factors smaller than itself (other than 1) is a composite number.Any number that has factors smaller than itself (other than 1) is a composite number.Any number that has factors smaller than itself (other than 1) is a composite number.

If you multiply a number by 0.8, the result is 20% less than the original number.

The prime number that is greater than 20 but less than 29 is 23.

Related questions

"12" has 6 factors.

12 and 18 each have six factors.

14

15

14

Your Mama! I mean 21.

'''They called composite numbers.''' '''Composite numbers are when they have more than two factors.''' '''A prime number is when it only has 2 factors no more or less.''' '''EX : 20''' '''Factors Of 20 : 1, 20, 2, 10, 4, 5.'''

They are 1, 2, 7 and 14.

91119 cannot be a factor of 20. So the question is nonsense.

Four of them.

Any number that has factors smaller than itself (other than 1) is a composite number.Any number that has factors smaller than itself (other than 1) is a composite number.Any number that has factors smaller than itself (other than 1) is a composite number.Any number that has factors smaller than itself (other than 1) is a composite number.

18: 1-18, 2-9, 3-6.