21258008

素因数分解:

$2^3\times {\mathrm{41}}^1\times {\mathrm{64811}}^1$

素因数の和:64858

約数の個数: 16

約数和(自身を含む): 40831560

約数和(自身を除く): 19573552

約数列:

[1, 2, 4, 8, 41, 82, 164, 328, 64811, 129622, 259244, 518488, 2657251, 5314502, 10629004, 21258008]

約数ペア:

[(1, 21258008), (2, 10629004), (4, 5314502), (8, 2657251), (41, 518488), (82, 259244), (164, 129622), (328, 64811)]