CREATE TABLE table_23487 ("Season" FLOAT, "Network" CLOB, "Host" CLOB, "Contestants" FLOAT, "Winner" CLOB, "Destination" CLOB)

What was the latest season with 20 contestants?
SELECT MAX("Season") FROM table_23487 WHERE "Contestants" = '20'
SELECT MAX("Season") FROM "table_23487" WHERE "Contestants" = '20'