'Twenty' in the Bible

Or what king, marching to encounter another king in war, does not first sit down and deliberate whether he is able with ten thousand men to meet the one who is advancing against him with twenty thousand?

So they hove the lead and found twenty fathoms of water; and after a short time they hove again and found fifteen fathoms.

Three times I have been beaten with Roman rods, once I have been stoned, three times I have been shipwrecked, once for full four and twenty hours I was floating on the open sea.