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Q: Which number between 10 and 20 has exactly 5 factors?

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A number that has exactly an odd number of factors is a power of another number. A number between 10 and 30 that is a power is 16. It is 24 (as well as 42) and its factors are 1, 2, 4, 8, and 16.

48

Any number of the form a*b^4 where a and b are different prime numbers, or c^9 where c is a prime, will have exactly 10 factors.

80

45

Any number n=q1q2...q10 with qi a prime number

Exactly halfway between them is 10.15.

The factors of 81 that are between 2 and 10 are 3 and 9.

no because every number is multiplied by 1 and it equals the same as the number...yay:D

12

48 has 10 factors.

How about 10 whose factors are 1 2 5 and 10

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