20807380

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{271}}^1\times {\mathrm{349}}^1$

素因数の和:640

約数の個数: 48

約数和(自身を含む): 47980800

約数和(自身を除く): 27173420

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 271, 349, 542, 698, 1084, 1355, 1396, 1745, 2710, 2981, 3490, 3839, 5420, 5962, 6980, 7678, 11924, 14905, 15356, 19195, 29810, 38390, 59620, 76780, 94579, 189158, 378316, 472895, 945790, 1040369, 1891580, 2080738, 4161476, 5201845, 10403690, 20807380]

約数ペア:

[(1, 20807380), (2, 10403690), (4, 5201845), (5, 4161476), (10, 2080738), (11, 1891580), (20, 1040369), (22, 945790), (44, 472895), (55, 378316), (110, 189158), (220, 94579), (271, 76780), (349, 59620), (542, 38390), (698, 29810), (1084, 19195), (1355, 15356), (1396, 14905), (1745, 11924), (2710, 7678), (2981, 6980), (3490, 5962), (3839, 5420)]