If n = 4p, where p is a prime number greater than 2, how many different positive even divisors does n have, including n ?
题目解答
历史版本-2 由andyxiahua更新于2013-09-24 15:33:09
由n=4p可知n必为偶数;因为p是大于2的质数,所以p必为奇数。根据n=2*2*p可知n共有(2+1)*(1+1)=6个因子,其中1和p为奇数,因此偶数因子共有4个。分别是2,4,2p,4p,正确答案为C。