Denver would love to get off Nnaji's contract. Plus, Kyle Anderson is a very smart basketball player and I think he would fit in really well in Denver. They would be a little lacking in overall team athleticism though.
Utah could get some assets for taking on Nnaji's contract. How many assets is dependent on how he performs this year, but I think a second round pick is pretty fair. Now that Nnaji has another traditional center to play next to off the bench, I think we could really see him come into his own. Personally, I think Zeke Nnaji has been miscast as a center for the vast majority of his minutes in Denver. Plus, Nnaji has only ever been given minutes in a high pressure context on a contending team where he'd be pulled for any small mistakes and didn't get consistent minutes. He's still young enough that he could be a reclamation project as a highly versatile big with shooting potential.