28181727

素因数分解:

$3^2\times 7^1\times {\mathrm{43}}^1\times {\mathrm{101}}^1\times {\mathrm{103}}^1$

素因数の和:260

約数の個数: 48

約数和(自身を含む): 48542208

約数和(自身を除く): 20360481

約数列:

[1, 3, 7, 9, 21, 43, 63, 101, 103, 129, 301, 303, 309, 387, 707, 721, 903, 909, 927, 2121, 2163, 2709, 4343, 4429, 6363, 6489, 10403, 13029, 13287, 30401, 31003, 31209, 39087, 39861, 72821, 91203, 93009, 93627, 218463, 273609, 279027, 447329, 655389, 1341987, 3131303, 4025961, 9393909, 28181727]

約数ペア:

[(1, 28181727), (3, 9393909), (7, 4025961), (9, 3131303), (21, 1341987), (43, 655389), (63, 447329), (101, 279027), (103, 273609), (129, 218463), (301, 93627), (303, 93009), (309, 91203), (387, 72821), (707, 39861), (721, 39087), (903, 31209), (909, 31003), (927, 30401), (2121, 13287), (2163, 13029), (2709, 10403), (4343, 6489), (4429, 6363)]