21618640

素因数分解:

$2^4\times 5^1\times {\mathrm{181}}^1\times {\mathrm{1493}}^1$

素因数の和:1687

約数の個数: 40

約数和(自身を含む): 50574888

約数和(自身を除く): 28956248

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 181, 362, 724, 905, 1448, 1493, 1810, 2896, 2986, 3620, 5972, 7240, 7465, 11944, 14480, 14930, 23888, 29860, 59720, 119440, 270233, 540466, 1080932, 1351165, 2161864, 2702330, 4323728, 5404660, 10809320, 21618640]

約数ペア:

[(1, 21618640), (2, 10809320), (4, 5404660), (5, 4323728), (8, 2702330), (10, 2161864), (16, 1351165), (20, 1080932), (40, 540466), (80, 270233), (181, 119440), (362, 59720), (724, 29860), (905, 23888), (1448, 14930), (1493, 14480), (1810, 11944), (2896, 7465), (2986, 7240), (3620, 5972)]