21279856

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{263}}^1\times {\mathrm{389}}^1$

素因数の和:673

約数の個数: 40

約数和(自身を含む): 44684640

約数和(自身を除く): 23404784

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 263, 389, 526, 778, 1052, 1556, 2104, 3112, 3419, 4208, 5057, 6224, 6838, 10114, 13676, 20228, 27352, 40456, 54704, 80912, 102307, 204614, 409228, 818456, 1329991, 1636912, 2659982, 5319964, 10639928, 21279856]

約数ペア:

[(1, 21279856), (2, 10639928), (4, 5319964), (8, 2659982), (13, 1636912), (16, 1329991), (26, 818456), (52, 409228), (104, 204614), (208, 102307), (263, 80912), (389, 54704), (526, 40456), (778, 27352), (1052, 20228), (1556, 13676), (2104, 10114), (3112, 6838), (3419, 6224), (4208, 5057)]