20642721

素因数分解:

$3^1\times {\mathrm{11}}^2\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{73}}^1$

素因数の和:158

約数の個数: 48

約数和(自身を含む): 33069120

約数和(自身を除く): 12426399

約数列:

[1, 3, 11, 19, 33, 41, 57, 73, 121, 123, 209, 219, 363, 451, 627, 779, 803, 1353, 1387, 2299, 2337, 2409, 2993, 4161, 4961, 6897, 8569, 8833, 8979, 14883, 15257, 25707, 26499, 32923, 45771, 56867, 94259, 98769, 167827, 170601, 282777, 362153, 503481, 625537, 1086459, 1876611, 6880907, 20642721]

約数ペア:

[(1, 20642721), (3, 6880907), (11, 1876611), (19, 1086459), (33, 625537), (41, 503481), (57, 362153), (73, 282777), (121, 170601), (123, 167827), (209, 98769), (219, 94259), (363, 56867), (451, 45771), (627, 32923), (779, 26499), (803, 25707), (1353, 15257), (1387, 14883), (2299, 8979), (2337, 8833), (2409, 8569), (2993, 6897), (4161, 4961)]