A quality 20 rep squat workout for anyone interested in this type of training:

Primal 20 Rep Squat Fullbody Workout

Workout A consists of the following exercises. Perform them in the order listed.

1. Squats. 5 sets x 5 reps.
2. Bench Press. 5 sets x 5 reps.
3. Pull Ups. 3 sets x max reps.
4. Weighted Sit Ups. 3 sets x 10-25 reps.
5. Barbell Curls. 3 sets x 8-10 reps.

Workout B consists of the following exercises. Perform them in the order listed.

1. Deadlifts. 1 set x 5 reps.
2. Overhead Press. 5 sets x 5 reps.
3. Dips. 3 sets x max reps.
4. Barbell Calf Raise. 3 sets x 10-25 reps.
5. Power Shrugs. 3 sets x 10-15 reps.

Workout C consists of the following exercises. Perform them in the order listed.

1. Squats. 1 set x 20 reps.
2. Close Grip Bench Press. 5 sets x 5 reps.
3. Barbell Rows. 5 sets x 5 reps
4. Planks. 3 sets x 60 seconds.
5. Dumbbell Curl. 3 sets x 8-10 reps.

Check the above link for more info.