21457521

素因数分解:

$3^3\times {\mathrm{37}}^1\times {\mathrm{47}}^1\times {\mathrm{457}}^1$

素因数の和:550

約数の個数: 32

約数和(自身を含む): 33415680

約数和(自身を除く): 11958159

約数列:

[1, 3, 9, 27, 37, 47, 111, 141, 333, 423, 457, 999, 1269, 1371, 1739, 4113, 5217, 12339, 15651, 16909, 21479, 46953, 50727, 64437, 152181, 193311, 456543, 579933, 794723, 2384169, 7152507, 21457521]

約数ペア:

[(1, 21457521), (3, 7152507), (9, 2384169), (27, 794723), (37, 579933), (47, 456543), (111, 193311), (141, 152181), (333, 64437), (423, 50727), (457, 46953), (999, 21479), (1269, 16909), (1371, 15651), (1739, 12339), (4113, 5217)]