user: Question: Name the number of panelists for 20 January 2006 air date
Columns: ['Episode Number', 'Air Date', 'Guest Host', 'Musical Guest (Song performed)', 'Who knows the most about the guest host? panelists']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, '6 January 2006', 'Billie Piper', 'Texas ( Sleep )', 'Jade Goody and Kenzie']
SQL:

assistant: SELECT COUNT("Who knows the most about the guest host? panelists") FROM "Table" WHERE "Air Date" = '20 January 2006';