twenty-one

[totient]

Counting only ones I've read, rather than ones I own but haven't read, or haven't read significant parts of:

The Adventures of Huckleberry Finn
Of Mice and Men
Harry Potter
Bridge to Terabithia
The Catcher in the Rye
In the Night Kitchen
Blubber
To Kill a Mockingbird
The Outsiders
The Pigman
Flowers for Algernon
James and the Giant Peach
Are You There, God? It’s Me, Margaret
The House of Spirits
Slaughterhouse-Five
Lord of the Flies
Native Son
The Adventures of Tom Sawyer
Summer of My German Soldier
Little Black Sambo
How to Eat Fried Worms

Fully a third of these were assigned reading at my high school.