How many series had viewers totaling 23.93 million?
CREATE TABLE table_18217753_1 (
    series__number VARCHAR,
    us_viewers__millions_ VARCHAR
)
SELECT COUNT(series__number) FROM table_18217753_1 WHERE us_viewers__millions_ = "23.93"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many series had viewers totaling 23.93 million? ### Input: CREATE TABLE table_18217753_1 (
    series__number VARCHAR,
    us_viewers__millions_ VARCHAR
) ### Response: SELECT COUNT(series__number) FROM table_18217753_1 WHERE us_viewers__millions_ = "23.93"