21901724

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{179}}^1\times {\mathrm{181}}^1$

素因数の和:390

約数の個数: 36

約数和(自身を含む): 41965560

約数和(自身を除く): 20063836

約数列:

[1, 2, 4, 13, 26, 52, 169, 179, 181, 338, 358, 362, 676, 716, 724, 2327, 2353, 4654, 4706, 9308, 9412, 30251, 30589, 32399, 60502, 61178, 64798, 121004, 122356, 129596, 421187, 842374, 1684748, 5475431, 10950862, 21901724]

約数ペア:

[(1, 21901724), (2, 10950862), (4, 5475431), (13, 1684748), (26, 842374), (52, 421187), (169, 129596), (179, 122356), (181, 121004), (338, 64798), (358, 61178), (362, 60502), (676, 32399), (716, 30589), (724, 30251), (2327, 9412), (2353, 9308), (4654, 4706)]