21138579

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^2\times {\mathrm{47}}^1\times {\mathrm{59}}^1$

素因数の和:141

約数の個数: 72

約数和(自身を含む): 39836160

約数和(自身を除く): 18697581

約数列:

[1, 3, 7, 9, 11, 21, 33, 47, 59, 63, 77, 99, 121, 141, 177, 231, 329, 363, 413, 423, 517, 531, 649, 693, 847, 987, 1089, 1239, 1551, 1947, 2541, 2773, 2961, 3619, 3717, 4543, 4653, 5687, 5841, 7139, 7623, 8319, 10857, 13629, 17061, 19411, 21417, 24957, 30503, 32571, 39809, 40887, 49973, 51183, 58233, 64251, 91509, 119427, 149919, 174699, 213521, 274527, 335533, 358281, 449757, 640563, 1006599, 1921689, 2348731, 3019797, 7046193, 21138579]

約数ペア:

[(1, 21138579), (3, 7046193), (7, 3019797), (9, 2348731), (11, 1921689), (21, 1006599), (33, 640563), (47, 449757), (59, 358281), (63, 335533), (77, 274527), (99, 213521), (121, 174699), (141, 149919), (177, 119427), (231, 91509), (329, 64251), (363, 58233), (413, 51183), (423, 49973), (517, 40887), (531, 39809), (649, 32571), (693, 30503), (847, 24957), (987, 21417), (1089, 19411), (1239, 17061), (1551, 13629), (1947, 10857), (2541, 8319), (2773, 7623), (2961, 7139), (3619, 5841), (3717, 5687), (4543, 4653)]