21487505

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{59}}^1\times {\mathrm{431}}^1$

素因数の和:521

約数の個数: 24

約数和(自身を含む): 28460160

約数和(自身を除く): 6972655

約数列:

[1, 5, 13, 59, 65, 169, 295, 431, 767, 845, 2155, 3835, 5603, 9971, 25429, 28015, 49855, 72839, 127145, 330577, 364195, 1652885, 4297501, 21487505]

約数ペア:

[(1, 21487505), (5, 4297501), (13, 1652885), (59, 364195), (65, 330577), (169, 127145), (295, 72839), (431, 49855), (767, 28015), (845, 25429), (2155, 9971), (3835, 5603)]