'Twenty' in the Bible

Then the people of Israel cried to the LORD for help; for he had nine hundred chariots of iron, and oppressed the people of Israel cruelly for twenty years.

Now Zebah and Zalmun'na were in Karkor with their army, about fifteen thousand men, all who were left of all the army of the people of the East; for there had fallen a hundred and twenty thousand men who drew the sword.

And he smote them from Aro'er to the neighborhood of Minnith, twenty cities, and as far as Abel-keramim, with a very great slaughter. So the Ammonites were subdued before the people of Israel.

And he judged Israel in the days of the Philistines twenty years.

Then his brothers and all his family came down and took him and brought him up and buried him between Zorah and Esh'ta-ol in the tomb of Mano'ah his father. He had judged Israel twenty years.