What is the lowest of Episode Number that has a Air Date on 20 july 2007?
CREATE TABLE table_7631 (
    "Episode Number" real,
    "Air Date" text,
    "Guest Host" text,
    "Musical Guest (Song performed)" text,
    "\"Coat of Cash\" Wearing Celebrity" text
)
SELECT MIN("Episode Number") FROM table_7631 WHERE "Air Date" = '20 july 2007'
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: What is the lowest of Episode Number that has a Air Date on 20 july 2007? ### Input: CREATE TABLE table_7631 (
    "Episode Number" real,
    "Air Date" text,
    "Guest Host" text,
    "Musical Guest (Song performed)" text,
    "\"Coat of Cash\" Wearing Celebrity" text
) ### Response: SELECT MIN("Episode Number") FROM table_7631 WHERE "Air Date" = '20 july 2007'