'Twenty' in the Bible

It pleased Darius to set over the kingdom an hundred and twenty princes, which should be over the whole kingdom;

On the twenty-fourth day of the first month, as I was standing on the bank of the great river, the Tigris,

But the prince of the kingdom of Persia withstood me one and twenty days: but, lo, Michael, one of the chief princes, came to help me; and I remained there with the kings of Persia.