SELECT MAX(no_in_season) FROM table_10718984_2 WHERE written_by = "Marlene Meyer" AND us_viewers__millions_ = "20.49"
Berapa angka di musim yang ditulis Marlene Meyer dan 20,49 juta orang menonton?
CREATE TABLE table_10718984_2 (no_in_season INTEGER, written_by VARCHAR, us_viewers__millions_ VARCHAR)