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_22181917_2 (original_air_date VARCHAR, season__number VARCHAR)
### Question:
How many original airdates did season 20 have?
### Answer:
SELECT COUNT(original_air_date) FROM table_22181917_2 WHERE season__number = 20