Since 19 is a Prime number, it only has two factors - 1 and 19.
31
34
26
79
-20 and 2
First list the factors of each. For 18, that's 1, 2, 3, 6, 9, and 18. For 20, that's 1, 2, 4, 5, 10, and 20. From these, you could add all of the factors of 18 to get 39. Or you could add 20, 10, and 9. Or 20, 10, 5, and 4. Or . . . you get the idea.
15 and 4 are the factors of 120 that add up to 19.
146
-13
1, 4, and 20. There are other factors, too.
34
167