user: ### NOW ANSWER:
Question: Which Weeks on Top have an Issue Date(s) of 20 November?
Columns: ['Volume:Issue', 'Issue Date(s)', 'Weeks on Top', 'Song', 'Artist']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['35:21-24', '19 December 1981 – 23 January 1982', 6.0, '" Physical "', 'Olivia Newton-John']
SQL:

assistant: SELECT SUM("Weeks on Top") FROM "Table" WHERE "Issue Date(s)" = '20 November';