20421604

素因数分解:

$2^2\times 7^1\times {\mathrm{73}}^1\times {\mathrm{97}}^1\times {\mathrm{103}}^1$

素因数の和:284

約数の個数: 48

約数和(自身を含む): 42235648

約数和(自身を除く): 21814044

約数列:

[1, 2, 4, 7, 14, 28, 73, 97, 103, 146, 194, 206, 292, 388, 412, 511, 679, 721, 1022, 1358, 1442, 2044, 2716, 2884, 7081, 7519, 9991, 14162, 15038, 19982, 28324, 30076, 39964, 49567, 52633, 69937, 99134, 105266, 139874, 198268, 210532, 279748, 729343, 1458686, 2917372, 5105401, 10210802, 20421604]

約数ペア:

[(1, 20421604), (2, 10210802), (4, 5105401), (7, 2917372), (14, 1458686), (28, 729343), (73, 279748), (97, 210532), (103, 198268), (146, 139874), (194, 105266), (206, 99134), (292, 69937), (388, 52633), (412, 49567), (511, 39964), (679, 30076), (721, 28324), (1022, 19982), (1358, 15038), (1442, 14162), (2044, 9991), (2716, 7519), (2884, 7081)]