CREATE TABLE table_16617011_1 (original_air_date VARCHAR, us_viewers__millions_ VARCHAR)

Name the number air date for 14.20 us viewers
SELECT COUNT(original_air_date) FROM table_16617011_1 WHERE us_viewers__millions_ = "14.20"
SELECT COUNT("original_air_date") FROM "table_16617011_1" WHERE "14.20" = "us_viewers__millions_"