21219561

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{389}}^1$

素因数の和:454

約数の個数: 48

約数和(自身を含む): 36504000

約数和(自身を除く): 15284439

約数列:

[1, 3, 9, 11, 19, 29, 33, 57, 87, 99, 171, 209, 261, 319, 389, 551, 627, 957, 1167, 1653, 1881, 2871, 3501, 4279, 4959, 6061, 7391, 11281, 12837, 18183, 22173, 33843, 38511, 54549, 66519, 81301, 101529, 124091, 214339, 243903, 372273, 643017, 731709, 1116819, 1929051, 2357729, 7073187, 21219561]

約数ペア:

[(1, 21219561), (3, 7073187), (9, 2357729), (11, 1929051), (19, 1116819), (29, 731709), (33, 643017), (57, 372273), (87, 243903), (99, 214339), (171, 124091), (209, 101529), (261, 81301), (319, 66519), (389, 54549), (551, 38511), (627, 33843), (957, 22173), (1167, 18183), (1653, 12837), (1881, 11281), (2871, 7391), (3501, 6061), (4279, 4959)]