18904280

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{11527}}^1$

素因数の和:11579

約数の個数: 32

約数和(自身を含む): 43575840

約数和(自身を除く): 24671560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 11527, 23054, 46108, 57635, 92216, 115270, 230540, 461080, 472607, 945214, 1890428, 2363035, 3780856, 4726070, 9452140, 18904280]

約数ペア:

[(1, 18904280), (2, 9452140), (4, 4726070), (5, 3780856), (8, 2363035), (10, 1890428), (20, 945214), (40, 472607), (41, 461080), (82, 230540), (164, 115270), (205, 92216), (328, 57635), (410, 46108), (820, 23054), (1640, 11527)]