20400490

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{227}}^1$

素因数の和:307

約数の個数: 64

約数和(自身を含む): 43338240

約数和(自身を除く): 22937750

約数列:

[1, 2, 5, 10, 11, 19, 22, 38, 43, 55, 86, 95, 110, 190, 209, 215, 227, 418, 430, 454, 473, 817, 946, 1045, 1135, 1634, 2090, 2270, 2365, 2497, 4085, 4313, 4730, 4994, 8170, 8626, 8987, 9761, 12485, 17974, 19522, 21565, 24970, 43130, 44935, 47443, 48805, 89870, 94886, 97610, 107371, 185459, 214742, 237215, 370918, 474430, 536855, 927295, 1073710, 1854590, 2040049, 4080098, 10200245, 20400490]

約数ペア:

[(1, 20400490), (2, 10200245), (5, 4080098), (10, 2040049), (11, 1854590), (19, 1073710), (22, 927295), (38, 536855), (43, 474430), (55, 370918), (86, 237215), (95, 214742), (110, 185459), (190, 107371), (209, 97610), (215, 94886), (227, 89870), (418, 48805), (430, 47443), (454, 44935), (473, 43130), (817, 24970), (946, 21565), (1045, 19522), (1135, 17974), (1634, 12485), (2090, 9761), (2270, 8987), (2365, 8626), (2497, 8170), (4085, 4994), (4313, 4730)]