user: Question: Of the series that last aired August 20, 2010, what is the lowest number of seasons?
Columns: ['Season', 'First Aired', 'Last Aired', 'Episodes', 'Network']
Types: ['real', 'text', 'text', 'real', 'text']
Sample row: [1.0, 'July 10, 2007', 'December 28, 2007', 18.0, 'NBC']
SQL:

assistant: SELECT MIN("Season") FROM "Table" WHERE "Last Aired" = 'August 20, 2010';