Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_25391981_20 (episode_number VARCHAR, episode VARCHAR)
### Question:
What number episode was Week 4, Part 1? 
### Answer:
SELECT episode_number FROM table_25391981_20 WHERE episode = "Week 4, Part 1"