Your questions are impossible for anyone to answer, run it and find out. That’s the only way you will know.
In terms of the actual routine I think it’s pretty good. I would probably put more a little more back work in but it’s not too bad. Would look at the calves work as you have 2 days at 4x20, it might be worth doing 4x20 of a seated exercise and the other day to a lower rep range standing calve exercise.
Main thing is how are you progressing it?
Also nutrition will make or break any routine, so make sure that’s all in check.
Without knowing more about your goals and where you currently are, this really is impossible to answer. Also… nobody can tell you if it’s optimal. Whether you’ll burn out or get overtrained has a lot to do with where you’re starting and how you recover outside of the weight room (nutrition and sleep). That’s a trial and error deal. You can get good starting points and that’s about it.
Food for thought: look at the amount of compound exercises you have in upper body vs the amount you have in lower body. You may benefit from more single joint work in your lower body days. If you’re training for strength, I’d recommend training biceps after triceps. You’re likely to find your numbers in bench and OHP go up quicker this way.
Without a periodization design and some indication of what intensity the weights you’re going to be using are, it’s really impossible to answer a lot of questions. As far as the actual split, I do the same arrangement for scheduling.
Depending on your goals, you might also find it beneficial to add some GPP workouts on at least one rest day. Prowler pushes, sled pulls, kettlebell workouts, etc.