CREATE TABLE table_14835826_1 (series__number VARCHAR2, us_viewers__millions_ VARCHAR2)

How many series had 18.77 million viewers?
SELECT COUNT(series__number) FROM table_14835826_1 WHERE us_viewers__millions_ = "18.77"
SELECT COUNT("series__number") FROM "table_14835826_1" WHERE "18.77" = "us_viewers__millions_"