How many odd, positive divisors does 740 have?
Choose the correct choice.
A) 6
B) 8
C) 12
D) 15
E) 24
Make a prime factorization of a number: 540=2^2*3^3*5 --&gt; get rid of powers of 2 as they give even factors --&gt; you'll have 3^3*5 which has (3+1)(1+1)=15 factors.   Another example: 60=2^2*3*5 it has (2+1)(1+1)(1+1)=12 factors out of which (1+1)(1+1)=4 are odd: 1, 3, 5 and 15 the same # of odd factors as 60/2^2=15 has.   Answer: 15.
<result>D</result>
How many odd, positive divisors does 740 have?