20157040

素因数分解:

$2^4\times 5^1\times {\mathrm{197}}^1\times {\mathrm{1279}}^1$

素因数の和:1489

約数の個数: 40

約数和(自身を含む): 47139840

約数和(自身を除く): 26982800

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 197, 394, 788, 985, 1279, 1576, 1970, 2558, 3152, 3940, 5116, 6395, 7880, 10232, 12790, 15760, 20464, 25580, 51160, 102320, 251963, 503926, 1007852, 1259815, 2015704, 2519630, 4031408, 5039260, 10078520, 20157040]

約数ペア:

[(1, 20157040), (2, 10078520), (4, 5039260), (5, 4031408), (8, 2519630), (10, 2015704), (16, 1259815), (20, 1007852), (40, 503926), (80, 251963), (197, 102320), (394, 51160), (788, 25580), (985, 20464), (1279, 15760), (1576, 12790), (1970, 10232), (2558, 7880), (3152, 6395), (3940, 5116)]