21246280

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{109}}^1\times {\mathrm{443}}^1$

素因数の和:574

約数の個数: 64

約数和(自身を含む): 52747200

約数和(自身を除く): 31500920

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 109, 110, 218, 220, 436, 440, 443, 545, 872, 886, 1090, 1199, 1772, 2180, 2215, 2398, 3544, 4360, 4430, 4796, 4873, 5995, 8860, 9592, 9746, 11990, 17720, 19492, 23980, 24365, 38984, 47960, 48287, 48730, 96574, 97460, 193148, 194920, 241435, 386296, 482870, 531157, 965740, 1062314, 1931480, 2124628, 2655785, 4249256, 5311570, 10623140, 21246280]

約数ペア:

[(1, 21246280), (2, 10623140), (4, 5311570), (5, 4249256), (8, 2655785), (10, 2124628), (11, 1931480), (20, 1062314), (22, 965740), (40, 531157), (44, 482870), (55, 386296), (88, 241435), (109, 194920), (110, 193148), (218, 97460), (220, 96574), (436, 48730), (440, 48287), (443, 47960), (545, 38984), (872, 24365), (886, 23980), (1090, 19492), (1199, 17720), (1772, 11990), (2180, 9746), (2215, 9592), (2398, 8860), (3544, 5995), (4360, 4873), (4430, 4796)]