21249657

素因数分解:

$3^2\times {\mathrm{11}}^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{79}}^1$

素因数の和:139

約数の個数: 72

約数和(自身を含む): 38729600

約数和(自身を除く): 17479943

約数列:

[1, 3, 9, 11, 13, 19, 33, 39, 57, 79, 99, 117, 121, 143, 171, 209, 237, 247, 363, 429, 627, 711, 741, 869, 1027, 1089, 1287, 1501, 1573, 1881, 2223, 2299, 2607, 2717, 3081, 4503, 4719, 6897, 7821, 8151, 9243, 9559, 11297, 13509, 14157, 16511, 19513, 20691, 24453, 28677, 29887, 33891, 49533, 58539, 86031, 89661, 101673, 124267, 148599, 175617, 181621, 214643, 268983, 372801, 544863, 643929, 1118403, 1634589, 1931787, 2361073, 7083219, 21249657]

約数ペア:

[(1, 21249657), (3, 7083219), (9, 2361073), (11, 1931787), (13, 1634589), (19, 1118403), (33, 643929), (39, 544863), (57, 372801), (79, 268983), (99, 214643), (117, 181621), (121, 175617), (143, 148599), (171, 124267), (209, 101673), (237, 89661), (247, 86031), (363, 58539), (429, 49533), (627, 33891), (711, 29887), (741, 28677), (869, 24453), (1027, 20691), (1089, 19513), (1287, 16511), (1501, 14157), (1573, 13509), (1881, 11297), (2223, 9559), (2299, 9243), (2607, 8151), (2717, 7821), (3081, 6897), (4503, 4719)]