Il numero 20090231, venti milioni novantamiladuecentotrentuno in Italiano, in Inglese si dice twenty million ninety thousand two hundred thirty-one.
Il numero ordinale 20090231° in inglese si dice twenty million ninety thousand two hundred thirty-first.
20090222: twenty million ninety thousand two hundred twenty-two
20090223: twenty million ninety thousand two hundred twenty-three
20090224: twenty million ninety thousand two hundred twenty-four
20090225: twenty million ninety thousand two hundred twenty-five
20090226: twenty million ninety thousand two hundred twenty-six
20090227: twenty million ninety thousand two hundred twenty-seven
20090228: twenty million ninety thousand two hundred twenty-eight
20090229: twenty million ninety thousand two hundred twenty-nine
20090230: twenty million ninety thousand two hundred thirty