Difference of - 20, and a Position smaller than 17 is the highest against?
CREATE TABLE table_37850 (
    "Position" real,
    "Team" text,
    "Points" real,
    "Played" real,
    "Drawn" real,
    "Lost" real,
    "Against" real,
    "Difference" text
)
SELECT MAX("Against") FROM table_37850 WHERE "Difference" = '- 20' AND "Position" < '17'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Difference of - 20, and a Position smaller than 17 is the highest against? ### Input: CREATE TABLE table_37850 (
    "Position" real,
    "Team" text,
    "Points" real,
    "Played" real,
    "Drawn" real,
    "Lost" real,
    "Against" real,
    "Difference" text
) ### Response: SELECT MAX("Against") FROM table_37850 WHERE "Difference" = '- 20' AND "Position" < '17'