'Twenty' in the Bible

They were reckoned by genealogy, after their generations, heads of their fathers' houses, mighty men of valor, twenty thousand two hundred.

Of the children of Ephraim twenty thousand eight hundred, mighty men of valor, famous men in their fathers' houses.

On the other side of the Jordan, of the Reubenites, and the Gadites, and of the half-tribe of Manasseh, with all kinds of instruments of war for the battle, one hundred twenty thousand.

of the sons of Kohath, Uriel the chief, and his brothers one hundred twenty;

of the sons of Merari, Asaiah the chief, and his brothers two hundred twenty;

David took from him one thousand chariots, and seven thousand horsemen, and twenty thousand footmen; and David hamstrung all the chariot horses, but reserved of them for one hundred chariots.

These were the sons of Levi after their fathers' houses, even the heads of the fathers' houses of those who were counted individually, in the number of names by their polls, who did the work for the service of the house of Yahweh, from twenty years old and upward.

For by the last words of David the sons of Levi were numbered, from twenty years old and upward.

But David didn't take the number of them from twenty years old and under, because Yahweh had said he would increase Israel like the stars of the sky.