15 and 16
2, 3, 4, 5 and 6
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The common factors of 165 and 240 are: 1, 3, 5, and 15
240 is a composite number because it has factors other than 1 and itself. It is not a prime number.Factors of 240 are 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120 and 240.Prime Factors: 2, 3, 5
To find all the factors of a number, it helps to break the number down into its prime factors first. 240 ends in 0, so obviously has 2 and 5 as prime factors. Divide it by 10 and we get 24, which is known to be 4x6 from times tables. Thus the prime factors of 240 are 2, 2, 2, 2, 3 and 5. To find all the other factors (other than 1 and itself) you simply multiply any combination of these prime factors together. Therefore the factors of 240 are: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120 and 240.
240 is the smallest number with at least 19 factors. 240 has twenty factors: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120, 240 262144 is the smallest number with EXACTLY 19 factors
1, 2, 4, 5, 10, 20