There are none.
Zero doesn't have any proper factors.
Zero. 5 is a prime so its only factors are 1 and 5. It, therefore, has no proper factors.
Every number is a factor of 0. However, 0 has no proper factors since no two numbers that are non-zero can multiply to give 0.
Zero is not a factor of 4. Zero is only a factor of zero! The factors of 4 are 1, 4, 2 The factors of zero are zero and any other number. Therefore the common factors are 1,2 and 4
No. Some proper factors are prime.
No, no prime number has proper factors.
1 doesn't have proper factors.
One has no proper factors.
The proper factors of 26 are 2 and 13
Prime numbers don't have proper factors.
The proper factors of 35 are 5 and 7.
Prime numbers don't have proper factors.