21089320

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{109}}^1\times {\mathrm{691}}^1$

素因数の和:818

約数の個数: 64

約数和(自身を含む): 54806400

約数和(自身を除く): 33717080

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 109, 140, 218, 280, 436, 545, 691, 763, 872, 1090, 1382, 1526, 2180, 2764, 3052, 3455, 3815, 4360, 4837, 5528, 6104, 6910, 7630, 9674, 13820, 15260, 19348, 24185, 27640, 30520, 38696, 48370, 75319, 96740, 150638, 193480, 301276, 376595, 527233, 602552, 753190, 1054466, 1506380, 2108932, 2636165, 3012760, 4217864, 5272330, 10544660, 21089320]

約数ペア:

[(1, 21089320), (2, 10544660), (4, 5272330), (5, 4217864), (7, 3012760), (8, 2636165), (10, 2108932), (14, 1506380), (20, 1054466), (28, 753190), (35, 602552), (40, 527233), (56, 376595), (70, 301276), (109, 193480), (140, 150638), (218, 96740), (280, 75319), (436, 48370), (545, 38696), (691, 30520), (763, 27640), (872, 24185), (1090, 19348), (1382, 15260), (1526, 13820), (2180, 9674), (2764, 7630), (3052, 6910), (3455, 6104), (3815, 5528), (4360, 4837)]