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Which number between 30 and 40 has an odd number of factors?
That number is 36.
Which numbers between 1 and 40 have an odd number of factors?
These numbers between 1 and 40 have an odd number of factors: 4, 9, 16, 25, 36.
How many odd factors are there?
Since any odd number can be a factor, there is an infinite amount of them.
How many factors does 1980 have?
The number 1,980 has 36 factors.
How many integers less than 100 have an odd number of factors?
There are 9 integers less than 100 that have an odd number of factors.Every factor of a number has a pair, eg 2 & 3 are a factor pair of 6; and so it would be expected that every number has an even number of factors.However, if the factor pair of a number are the same number (eg 6 & 6 are a factor pair of 36), then there will be an odd number of factors.When there is a repeated factor like this, the number is a perfect square.Thus only perfect squares have an odd number of factors.Less than 100 there are 9 perfect squares (1, 4, 9, 16, 25, 36, 49, 64 & 81) which have an odd number of factors.100 itself is a perfect square and also has an odd number of factors, but the question asked for those numbers less than 100 with an odd number of factors.
