21509215

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{1153}}^1$

素因数の和:1219

約数の個数: 32

約数和(自身を含む): 32570496

約数和(自身を除く): 11061281

約数列:

[1, 5, 7, 13, 35, 41, 65, 91, 205, 287, 455, 533, 1153, 1435, 2665, 3731, 5765, 8071, 14989, 18655, 40355, 47273, 74945, 104923, 236365, 330911, 524615, 614549, 1654555, 3072745, 4301843, 21509215]

約数ペア:

[(1, 21509215), (5, 4301843), (7, 3072745), (13, 1654555), (35, 614549), (41, 524615), (65, 330911), (91, 236365), (205, 104923), (287, 74945), (455, 47273), (533, 40355), (1153, 18655), (1435, 14989), (2665, 8071), (3731, 5765)]