21257721

素因数分解:

$3^4\times {\mathrm{37}}^1\times {\mathrm{41}}^1\times {\mathrm{173}}^1$

素因数の和:263

約数の個数: 40

約数和(自身を含む): 33602184

約数和(自身を除く): 12344463

約数列:

[1, 3, 9, 27, 37, 41, 81, 111, 123, 173, 333, 369, 519, 999, 1107, 1517, 1557, 2997, 3321, 4551, 4671, 6401, 7093, 13653, 14013, 19203, 21279, 40959, 57609, 63837, 122877, 172827, 191511, 262441, 518481, 574533, 787323, 2361969, 7085907, 21257721]

約数ペア:

[(1, 21257721), (3, 7085907), (9, 2361969), (27, 787323), (37, 574533), (41, 518481), (81, 262441), (111, 191511), (123, 172827), (173, 122877), (333, 63837), (369, 57609), (519, 40959), (999, 21279), (1107, 19203), (1517, 14013), (1557, 13653), (2997, 7093), (3321, 6401), (4551, 4671)]