Just how many UFA's do the Bills have?

Mike Schopp and Bulldog open the show talking about the Bills heading into the offseason with 23 UFAs they have to deal with. What moves do we expect to make if they were to lose guys like Connor McGovern or David Edwards, how many new additions will we see to the Bills defense. Which UFA will the Bills try to bring back, who do we want them to bring back?