21078215

素因数分解:

$5^1\times {\mathrm{17}}^2\times {\mathrm{29}}^1\times {\mathrm{503}}^1$

素因数の和:571

約数の個数: 24

約数和(自身を含む): 27851040

約数和(自身を除く): 6772825

約数列:

[1, 5, 17, 29, 85, 145, 289, 493, 503, 1445, 2465, 2515, 8381, 8551, 14587, 41905, 42755, 72935, 145367, 247979, 726835, 1239895, 4215643, 21078215]

約数ペア:

[(1, 21078215), (5, 4215643), (17, 1239895), (29, 726835), (85, 247979), (145, 145367), (289, 72935), (493, 42755), (503, 41905), (1445, 14587), (2465, 8551), (2515, 8381)]