I think those CRJ's are 50-seater, plus a crew of 3, 2 up front and one in the cabin.
We flew into Denver on one last wednesday, and out on another 4 hours later.
The CRJ comes in a number of variants. SkyWest, the airline involved has a number of seating capacities depending upon scope limits and partner airlines needs. At the lower end are CRJ-200s with 50 seats, ranging up to 76 seats on CRJ-900 frames.