Name the gdp world rank for asian rank being 20
CREATE TABLE "list_of_asian_countries_by_gdp_per_capit" (
  "asian_rank" real,
  "world_rank" real,
  "country" text,
  "gdp_per_capita" text,
  "gdp_world_rank" text
);
SELECT "gdp_world_rank" FROM "list_of_asian_countries_by_gdp_per_capit" WHERE "asian_rank"=20;