1 and 19
lol 211548==
68.4
They are: 7 and 12
No. Some proper factors are prime.
One has no proper factors.
1 doesn't have proper factors.
No, no prime number has proper factors.
Proper factors do not include one and the number itself.
Prime numbers don't have proper factors.
The proper factors of 26 are 2 and 13
Prime numbers don't have proper factors.