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_2249029_1 ( gdp_world_rank VARCHAR, asian_rank VARCHAR )

### Question ###
Name the gdp world rank for asian rank being 20

### Accurate SQL ###

SELECT gdp_world_rank FROM table_2249029_1 WHERE asian_rank = 20