CREATE TABLE table_46091 ("Country" TEXT, "Population  ( July 2005 est. ) " FLOAT, "Land Area  ( km\\u00b2 ) " FLOAT, "% of arable land  ( 2005 est. ) " TEXT, "Arable Land  ( km\\u00b2 ) " FLOAT, "Population Density  ( pop per km\\u00b2 ) " FLOAT)

What's the arable land for the population of 20,090,437?
SELECT MAX("Arable Land (km\u00b2)") FROM table_46091 WHERE "Population (July 2005 est.)" = '20,090,437'
SELECT MAX("Arable Land (km\u00b2)") FROM "table_46091" WHERE "Population (July 2005 est.)" = '20,090,437'