21405584

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{78697}}^1$

素因数の和:78722

約数の個数: 20

約数和(自身を含む): 43913484

約数和(自身を除く): 22507900

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 272, 78697, 157394, 314788, 629576, 1259152, 1337849, 2675698, 5351396, 10702792, 21405584]

約数ペア:

[(1, 21405584), (2, 10702792), (4, 5351396), (8, 2675698), (16, 1337849), (17, 1259152), (34, 629576), (68, 314788), (136, 157394), (272, 78697)]