21353787

素因数分解:

$3^4\times 7^1\times {\mathrm{13}}^1\times {\mathrm{2897}}^1$

素因数の和:2929

約数の個数: 40

約数和(自身を含む): 39273696

約数和(自身を除く): 17919909

約数列:

[1, 3, 7, 9, 13, 21, 27, 39, 63, 81, 91, 117, 189, 273, 351, 567, 819, 1053, 2457, 2897, 7371, 8691, 20279, 26073, 37661, 60837, 78219, 112983, 182511, 234657, 263627, 338949, 547533, 790881, 1016847, 1642599, 2372643, 3050541, 7117929, 21353787]

約数ペア:

[(1, 21353787), (3, 7117929), (7, 3050541), (9, 2372643), (13, 1642599), (21, 1016847), (27, 790881), (39, 547533), (63, 338949), (81, 263627), (91, 234657), (117, 182511), (189, 112983), (273, 78219), (351, 60837), (567, 37661), (819, 26073), (1053, 20279), (2457, 8691), (2897, 7371)]