What number episode was Week 4, Part 2?
CREATE TABLE table_25391981_20 (episode_number VARCHAR, episode VARCHAR)
SELECT episode_number FROM table_25391981_20 WHERE episode = "Week 4, Part 2"
### Context: CREATE TABLE table_25391981_20 (episode_number VARCHAR, episode VARCHAR) ### Question: What number episode was Week 4, Part 2? ### Answer: SELECT episode_number FROM table_25391981_20 WHERE episode = "Week 4, Part 2"