I would vote for renting, too.
I’ve used 3/4” diameter /2’ length PVC pipes & shower curtains to make 3-side 6’tall walls to my 10’ x 10’ booth, but it’s somewhat unstable, and it was difficult to setup & takedown by myself.
I don’t think it will hold 20’ length, even if you add vertical support here and there.
So I think renting “professional” grade pipe & drape would be a better idea.
Hope it helps, good luck!