20879859

素因数分解:

$3^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{409}}^1$

素因数の和:460

約数の個数: 64

約数和(自身を含む): 39674880

約数和(自身を除く): 18795021

約数列:

[1, 3, 7, 11, 13, 17, 21, 33, 39, 51, 77, 91, 119, 143, 187, 221, 231, 273, 357, 409, 429, 561, 663, 1001, 1227, 1309, 1547, 2431, 2863, 3003, 3927, 4499, 4641, 5317, 6953, 7293, 8589, 13497, 15951, 17017, 20859, 31493, 37219, 48671, 51051, 58487, 76483, 90389, 94479, 111657, 146013, 175461, 229449, 271167, 409409, 535381, 632723, 994279, 1228227, 1606143, 1898169, 2982837, 6959953, 20879859]

約数ペア:

[(1, 20879859), (3, 6959953), (7, 2982837), (11, 1898169), (13, 1606143), (17, 1228227), (21, 994279), (33, 632723), (39, 535381), (51, 409409), (77, 271167), (91, 229449), (119, 175461), (143, 146013), (187, 111657), (221, 94479), (231, 90389), (273, 76483), (357, 58487), (409, 51051), (429, 48671), (561, 37219), (663, 31493), (1001, 20859), (1227, 17017), (1309, 15951), (1547, 13497), (2431, 8589), (2863, 7293), (3003, 6953), (3927, 5317), (4499, 4641)]