'Twenty' in the Bible

It hath been good before Darius, and he hath established over the kingdom satraps -- a hundred and twenty -- that they may be throughout the whole kingdom,

And in the twenty and fourth day of the first month, I have been by the side of the great river, that is Hiddekel:

'And the head of the kingdom of Persia is standing over-against me twenty and one days, and lo, Michael, first of the chief heads, hath come in to help me, and I have remained there near the kings of Persia;