user: Question: What was the Week number on November 20, 1977?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 18, 1977', 'at Denver Broncos', 'L 7-0', 75002.0]
SQL:

assistant: SELECT "Week" FROM "Table" WHERE "Date" = 'November 20, 1977';