21085900

素因数分解:

$2^2\times 5^2\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{661}}^1$

素因数の和:715

約数の個数: 72

約数和(自身を含む): 51715440

約数和(自身を除く): 30629540

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 25, 29, 44, 50, 55, 58, 100, 110, 116, 145, 220, 275, 290, 319, 550, 580, 638, 661, 725, 1100, 1276, 1322, 1450, 1595, 2644, 2900, 3190, 3305, 6380, 6610, 7271, 7975, 13220, 14542, 15950, 16525, 19169, 29084, 31900, 33050, 36355, 38338, 66100, 72710, 76676, 95845, 145420, 181775, 191690, 210859, 363550, 383380, 421718, 479225, 727100, 843436, 958450, 1054295, 1916900, 2108590, 4217180, 5271475, 10542950, 21085900]

約数ペア:

[(1, 21085900), (2, 10542950), (4, 5271475), (5, 4217180), (10, 2108590), (11, 1916900), (20, 1054295), (22, 958450), (25, 843436), (29, 727100), (44, 479225), (50, 421718), (55, 383380), (58, 363550), (100, 210859), (110, 191690), (116, 181775), (145, 145420), (220, 95845), (275, 76676), (290, 72710), (319, 66100), (550, 38338), (580, 36355), (638, 33050), (661, 31900), (725, 29084), (1100, 19169), (1276, 16525), (1322, 15950), (1450, 14542), (1595, 13220), (2644, 7975), (2900, 7271), (3190, 6610), (3305, 6380)]