21026440

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{12821}}^1$

素因数の和:12873

約数の個数: 32

約数和(自身を含む): 48467160

約数和(自身を除く): 27440720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 12821, 25642, 51284, 64105, 102568, 128210, 256420, 512840, 525661, 1051322, 2102644, 2628305, 4205288, 5256610, 10513220, 21026440]

約数ペア:

[(1, 21026440), (2, 10513220), (4, 5256610), (5, 4205288), (8, 2628305), (10, 2102644), (20, 1051322), (40, 525661), (41, 512840), (82, 256420), (164, 128210), (205, 102568), (328, 64105), (410, 51284), (820, 25642), (1640, 12821)]