21289816

素因数分解:

$2^3\times {\mathrm{43}}^1\times {\mathrm{199}}^1\times {\mathrm{311}}^1$

素因数の和:559

約数の個数: 32

約数和(自身を含む): 41184000

約数和(自身を除く): 19894184

約数列:

[1, 2, 4, 8, 43, 86, 172, 199, 311, 344, 398, 622, 796, 1244, 1592, 2488, 8557, 13373, 17114, 26746, 34228, 53492, 61889, 68456, 106984, 123778, 247556, 495112, 2661227, 5322454, 10644908, 21289816]

約数ペア:

[(1, 21289816), (2, 10644908), (4, 5322454), (8, 2661227), (43, 495112), (86, 247556), (172, 123778), (199, 106984), (311, 68456), (344, 61889), (398, 53492), (622, 34228), (796, 26746), (1244, 17114), (1592, 13373), (2488, 8557)]