21220953

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{29}}^2\times {\mathrm{647}}^1$

素因数の和:721

約数の個数: 24

約数和(自身を含む): 31606848

約数和(自身を除く): 10385895

約数列:

[1, 3, 13, 29, 39, 87, 377, 647, 841, 1131, 1941, 2523, 8411, 10933, 18763, 25233, 32799, 56289, 243919, 544127, 731757, 1632381, 7073651, 21220953]

約数ペア:

[(1, 21220953), (3, 7073651), (13, 1632381), (29, 731757), (39, 544127), (87, 243919), (377, 56289), (647, 32799), (841, 25233), (1131, 18763), (1941, 10933), (2523, 8411)]