Find the hidden number(s) in the image

2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 17, 18, 19, 20

0 1 2 3 4 5 7 8 9 12 15 17 18 19 20

2,12,15,3,19,5

8,2,5,19,8

2 8 19

9,18,7

15

8