'Twenty' in the Bible

Then the Israelites cried out to the Lord [for help], for Jabin had nine hundred iron chariots and had oppressed and tormented the sons of Israel severely for twenty years.

And from Aroer to the entrance of Minnith he struck them, twenty cities, and as far as Abel-keramim (brook by the vineyard), with a very great defeat. So the Ammonites were subdued and humbled before the Israelites.

And Samson judged Israel in the days of [occupation by] the Philistines for twenty years.

Then his brothers and his father’s entire [tribal] household came down, took him, and brought him up; and they buried him in the tomb of Manoah his father, [which was] between Zorah and Eshtaol. So Samson had judged Israel for twenty years.