21012901

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^3\times {\mathrm{47}}^1$

素因数の和:118

約数の個数: 32

約数和(自身を含む): 28062720

約数和(自身を除く): 7049819

約数列:

[1, 7, 13, 17, 47, 91, 119, 221, 289, 329, 611, 799, 1547, 2023, 3757, 4277, 4913, 5593, 10387, 13583, 26299, 34391, 63869, 72709, 95081, 176579, 230911, 447083, 1236053, 1616377, 3001843, 21012901]

約数ペア:

[(1, 21012901), (7, 3001843), (13, 1616377), (17, 1236053), (47, 447083), (91, 230911), (119, 176579), (221, 95081), (289, 72709), (329, 63869), (611, 34391), (799, 26299), (1547, 13583), (2023, 10387), (3757, 5593), (4277, 4913)]