52 has 6 factors.
56
Every one of them has an even number of factors.
56
The factors of a number cannot be greater than the number itself. So there are no factors of 4 between 30 and 50.
None of them.
30 is the only number between 20 and 50 that is a factor of 60
No numbers in that range have an odd number of factors.
48?
48 has 10 factors.
A number between 50 and 200 is 125 Its prime factors are: 5, 5 and 5 or 53 = 125
The answer is 50 because its factors are 1,2,5,10,25,50. When you add up the sum of 50 you get 5 which is a prime number. Also it is between 44 and 53. :)
60, 72, 84, 90 and 96 each have twelve factors.