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_23958944_6 ( us_viewers__in_millions_ VARCHAR, production_number VARCHAR )

### Question ###
Name the viewers for 520

### Accurate SQL ###

SELECT us_viewers__in_millions_ FROM table_23958944_6 WHERE production_number = 520