Table:
text: Swimming at the 2007 World Aquatics Championships – Men's 50 metre butterfly
Heats
Heat 20
Heat_Rank Lane Swimmer Country Time_ Overall_Rank
1 4 Roland Schoeman South Africa 23.49 2
2 1 Lars Frölander Sweden 23.66 4
3 7 Jakob Andkjær Denmark 23.92 7
4 3 Frédérick Bousquet France 24.00 11
5 6 Lyndon Ferns South Africa 24.05 15
6 7 Jernej Godec Slovenia 24.06 T16
7 2 Corney Swanepoel New Zealand 24.20 20
8 8 Benjamin Starke Germany 24.25 23

Question: Tell me Roland Schoeman's overall placing in swimming at the 2007 World Aquatics Championships - men's 50m butterfly, 20 heats?