Il numero romano MMMDCCXX nel sistema decimale vale: 3720.
MMMDCCXX in latino si scrive tria milia septingenti viginti,
mentre in italiano tremilasettecentoventi.
MMMDCCI, MMMDCCII, MMMDCCIII, MMMDCCIV, MMMDCCV, MMMDCCVI, MMMDCCVII, MMMDCCVIII, MMMDCCIX, MMMDCCX, MMMDCCXI, MMMDCCXII, MMMDCCXIII, MMMDCCXIV, MMMDCCXV, MMMDCCXVI, MMMDCCXVII, MMMDCCXVIII, MMMDCCXIX, MMMDCCXXI, MMMDCCXXII, MMMDCCXXIII, MMMDCCXXIV, MMMDCCXXV, MMMDCCXXVI, MMMDCCXXVII, MMMDCCXXVIII, MMMDCCXXIX, MMMDCCXXX, MMMDCCXXXI, MMMDCCXXXII, MMMDCCXXXIII, MMMDCCXXXIV, MMMDCCXXXV, MMMDCCXXXVI, MMMDCCXXXVII, MMMDCCXXXVIII, MMMDCCXXXIX