665020

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{811}}^1$

素因数の和:861

約数の個数: 24

約数和(自身を含む): 1432368

約数和(自身を除く): 767348

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 811, 820, 1622, 3244, 4055, 8110, 16220, 33251, 66502, 133004, 166255, 332510, 665020]

約数ペア:

[(1, 665020), (2, 332510), (4, 166255), (5, 133004), (10, 66502), (20, 33251), (41, 16220), (82, 8110), (164, 4055), (205, 3244), (410, 1622), (811, 820)]