Were twenty and four thousand. "Fell in one day three and twenty thousand," says St. Paul (1 Corinthians 10:8). As the Septuagint does not deviate here from the Hebrew, the Apostle must have followed some Rabbinical tradition.
It is possible enough that the odd thousand died on some other day than the one of which he speaks, or they may have died by the hands of the judges, and not by the plague.