How many episodes have 18.73 million viewers?
CREATE TABLE table_29541 (
    "No. in series" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Prod. No." real,
    "Viewers (millions)" text
)
SELECT COUNT("No. in series") FROM table_29541 WHERE "Viewers (millions)" = '18.73'
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 episodes have 18.73 million viewers? ### Input: CREATE TABLE table_29541 (
    "No. in series" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Prod. No." real,
    "Viewers (millions)" text
) ### Response: SELECT COUNT("No. in series") FROM table_29541 WHERE "Viewers (millions)" = '18.73'