2, 4, 6, 10, 12, 20, 30, 60 add up to 144.
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2 is the only even Prime number. All even numbers (numbers ending in 0, 2, 4, 6, or 8) have 2 as a factor.
The sum of the factors of any negative number is zero.
It is only possible to have one even prime factor of any number - as there is only one even prime number, 2. The sum of these is therefore 2.
If you compare 36 to any other even number, they will have at least 1 and 2 in common.
The factors of 49 are 1, 7, and 49. When you add them together you get 57, which is the sum.
All nonzero numbers have factors. Some factors are even numbers, some factors are odd numbers.