One Piece Chapter 20

Chapter 20 is adapted in anime episode 8.

Orange Town arc · East Blue saga

Manga

Chapter 20

Anime episode

Episode 8Who Will Win? Showdown Between the True Powers of the Devil Fruit!

One Pace

Pirate Buggy "the Clown"Covers chapters 19–21

Live action

Season 1, Episode 2Roughly chapters 8–22

The details

Chapter 20 is adapted in anime episode 8. That episode also covers chapters 19–21, so it is not a one-to-one adaptation.

One Pace re-cuts the anime to follow the manga's pacing, removing filler and padding. This chapter appears in Pirate Buggy "the Clown".

Netflix's live action passes through this chapter in season 1, episode 2, which covers roughly chapters 8–22 in a single hour. That is a span rather than a chapter list on purpose — the show reorders and merges as it goes, so nobody can honestly map it panel for panel.