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_2602958_4 ( _number VARCHAR, prod_code VARCHAR )

### Question ###
Which episodein season 3 had 175020 for a production code?

### Accurate SQL ###

SELECT _number FROM table_2602958_4 WHERE prod_code = 175020