How many had a length of 455?
CREATE TABLE table_20937 (
    "Number" real,
    "Name" text,
    "Kilometer" real,
    "Pavement" text,
    "Length (m)" real,
    "Average climb (%)" real
)
SELECT COUNT("Name") FROM table_20937 WHERE "Length (m)" = '455'
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: How many had a length of 455? ### Input: CREATE TABLE table_20937 (
    "Number" real,
    "Name" text,
    "Kilometer" real,
    "Pavement" text,
    "Length (m)" real,
    "Average climb (%)" real
) ### Response: SELECT COUNT("Name") FROM table_20937 WHERE "Length (m)" = '455'