20
20
100,000,000,000,000,000,000 {a 1 with 20 zeros}, or 100 quintillion.
nothing
20 is the next number greater than 19. The next prime number greater than 19 is 23.
10
20
220
The whole number that immediately follows 19 is 20.
42
10
37
20
100,000,000,000,000,000,000 {a 1 with 20 zeros}, or 100 quintillion.
65
37
37