0
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
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Which number less than 20 has the most factors how many are there?
"12" has 6 factors.
What are all the factors of the number which is 6 less than 20?
They are 1, 2, 7 and 14.
Explain why 20 is considered to be 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.Any number that has factors smaller than itself (other than 1) is a composite number.
How do you get 20 percent less of a number?
If you multiply a number by 0.8, the result is 20% less than the original number.
What is a prime number that is greater than 20 but less than 29?
The prime number that is greater than 20 but less than 29 is 23.
