The Roman numeral MDCCCXX corresponds to the Arabic number 1820.
MDCCCXX = 1820
Symbols are written and read from left to right, from highest to lowest.
If number MDCCCXX is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 1820.
MDCCCXIX is number 1819
MDCCCXXI is number 1821
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