According to the Mangadex page, chapter 20 is the last. I'm not entirely sure if that's true or not (I already read it on mangakalot) given that it doesn't really finish the story.
Did the manga end prematurely I order to boost novel sales?
@StormConstantine You sound like the kind of person that would make smart choices in a battle manga and then get killed off early on because the author realized that you would otherwise become too powerful.