21681825

素因数分解:

$3^1\times 5^2\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{641}}^1$

素因数の和:706

約数の個数: 48

約数和(自身を含む): 40122432

約数和(自身を除く): 18440607

約数列:

[1, 3, 5, 11, 15, 25, 33, 41, 55, 75, 123, 165, 205, 275, 451, 615, 641, 825, 1025, 1353, 1923, 2255, 3075, 3205, 6765, 7051, 9615, 11275, 16025, 21153, 26281, 33825, 35255, 48075, 78843, 105765, 131405, 176275, 289091, 394215, 528825, 657025, 867273, 1445455, 1971075, 4336365, 7227275, 21681825]

約数ペア:

[(1, 21681825), (3, 7227275), (5, 4336365), (11, 1971075), (15, 1445455), (25, 867273), (33, 657025), (41, 528825), (55, 394215), (75, 289091), (123, 176275), (165, 131405), (205, 105765), (275, 78843), (451, 48075), (615, 35255), (641, 33825), (825, 26281), (1025, 21153), (1353, 16025), (1923, 11275), (2255, 9615), (3075, 7051), (3205, 6765)]