user: Question: How many series had viewers totaling 23.93 million?
Columns: ['Series #', 'Season #', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [24.0, 1.0, '" Next "', 'Larry Shaw', 'Jenna Bans & Kevin Murphy', 'September25,2005', '28.36']
SQL:

assistant: SELECT COUNT("Series #") FROM "Table" WHERE "U.S. viewers (millions)" = '23.93';