Table:
text: 1964 San Diego Chargers season
Season schedule
Season schedule
Week Date_ Opponent Result_ Attendance
11 November 26, 1964 Buffalo Bills L 27–24 31860
12 December 6, 1964 New York Jets W 38–3 25753
13 December 13, 1964 Kansas City Chiefs L 49–6 26562
14 December 20, 1964 at Oakland Raiders L 21–20 20124

Question: How many people attended the San Diego Chargers game on December 20, 1964 during the 1964 season?