Il numero 1820, milleottocentoventi in Italiano, in Inglese si dice one thousand eight hundred twenty.
Il numero ordinale 1820° in inglese si dice one thousand eight hundred twentieth.
1811: one thousand eight hundred eleven
1812: one thousand eight hundred twelve
1813: one thousand eight hundred thirteen
1814: one thousand eight hundred fourteen
1815: one thousand eight hundred fifteen
1816: one thousand eight hundred sixteen
1817: one thousand eight hundred seventeen
1818: one thousand eight hundred eighteen
1819: one thousand eight hundred nineteen
1821: one thousand eight hundred twenty-one
1822: one thousand eight hundred twenty-two
1823: one thousand eight hundred twenty-three
1824: one thousand eight hundred twenty-four
1825: one thousand eight hundred twenty-five
1826: one thousand eight hundred twenty-six
1827: one thousand eight hundred twenty-seven
1828: one thousand eight hundred twenty-eight
1829: one thousand eight hundred twenty-nine