Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_54019 ( "Airing date" text, "English title (Chinese title)" text, "Number of episodes" real, "Genre" text, "Official website" text )

### Question ###
What is the airing date for costume comedy that has 20 episodes?

### Accurate SQL ###

SELECT "Airing date" FROM table_54019 WHERE "Number of episodes" = '20' AND "Genre" = 'costume comedy'