Almost all of the two digit composite numbers have two one digit factors that have a sum.
36
11, 22, 36 and 84
11, 22, 36 and 84
Sum of even factors of a number will always equal an even number.
The sum of the factors of any negative number is zero.
63
63? But it has more than two one-digit factors.
63.
99 + 9 = 108
There are four of each.
36
11, 22, 36 and 84
36 The factors of 36 are : 36,18,12,9,6,4,3,2 and 1.
2.3
6
It's not entirely clear from the wording of your question what it is you want to know. Seven is a one-digit number. The sum of its digits is 7. Seven has two factors: 1 and 7. That sum is 8.
105 is the sum