20840505

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{41}}^1\times {\mathrm{47}}^1\times {\mathrm{103}}^1$

素因数の和:206

約数の個数: 64

約数和(自身を含む): 40255488

約数和(自身を除く): 19414983

約数列:

[1, 3, 5, 7, 15, 21, 35, 41, 47, 103, 105, 123, 141, 205, 235, 287, 309, 329, 515, 615, 705, 721, 861, 987, 1435, 1545, 1645, 1927, 2163, 3605, 4223, 4305, 4841, 4935, 5781, 9635, 10815, 12669, 13489, 14523, 21115, 24205, 28905, 29561, 33887, 40467, 63345, 67445, 72615, 88683, 101661, 147805, 169435, 198481, 202335, 443415, 508305, 595443, 992405, 1389367, 2977215, 4168101, 6946835, 20840505]

約数ペア:

[(1, 20840505), (3, 6946835), (5, 4168101), (7, 2977215), (15, 1389367), (21, 992405), (35, 595443), (41, 508305), (47, 443415), (103, 202335), (105, 198481), (123, 169435), (141, 147805), (205, 101661), (235, 88683), (287, 72615), (309, 67445), (329, 63345), (515, 40467), (615, 33887), (705, 29561), (721, 28905), (861, 24205), (987, 21115), (1435, 14523), (1545, 13489), (1645, 12669), (1927, 10815), (2163, 9635), (3605, 5781), (4223, 4935), (4305, 4841)]