21528639

素因数分解:

$3^3\times {\mathrm{11}}^1\times {\mathrm{173}}^1\times {\mathrm{419}}^1$

素因数の和:612

約数の個数: 32

約数和(自身を含む): 35078400

約数和(自身を除く): 13549761

約数列:

[1, 3, 9, 11, 27, 33, 99, 173, 297, 419, 519, 1257, 1557, 1903, 3771, 4609, 4671, 5709, 11313, 13827, 17127, 41481, 51381, 72487, 124443, 217461, 652383, 797357, 1957149, 2392071, 7176213, 21528639]

約数ペア:

[(1, 21528639), (3, 7176213), (9, 2392071), (11, 1957149), (27, 797357), (33, 652383), (99, 217461), (173, 124443), (297, 72487), (419, 51381), (519, 41481), (1257, 17127), (1557, 13827), (1903, 11313), (3771, 5709), (4609, 4671)]