CREATE TABLE table_34514 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Record" TEXT, "Game Site" TEXT, "Attendance" TEXT)

Result of l 17 20 had what attendance?
SELECT "Attendance" FROM table_34514 WHERE "Result" = 'l 17–20'
SELECT "Attendance" FROM "table_34514" WHERE "Result" = 'l 17–20'