1 and 19
lol 211548==
68.4
They are: 7 and 12
No. Some proper factors are prime.
No, no prime number has proper factors.
One has no proper factors.
1 doesn't have proper factors.
Proper factors do not include one and the number itself.
Prime numbers don't have proper factors.
Prime numbers don't have proper factors.
The proper factors of 22 are 2 and 11.