18720405

素因数分解:

$3^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{59}}^1\times {\mathrm{641}}^1$

素因数の和:722

約数の個数: 48

約数和(自身を含む): 36054720

約数和(自身を除く): 17334315

約数列:

[1, 3, 5, 9, 11, 15, 33, 45, 55, 59, 99, 165, 177, 295, 495, 531, 641, 649, 885, 1923, 1947, 2655, 3205, 3245, 5769, 5841, 7051, 9615, 9735, 21153, 28845, 29205, 35255, 37819, 63459, 105765, 113457, 189095, 317295, 340371, 416009, 567285, 1248027, 1701855, 2080045, 3744081, 6240135, 18720405]

約数ペア:

[(1, 18720405), (3, 6240135), (5, 3744081), (9, 2080045), (11, 1701855), (15, 1248027), (33, 567285), (45, 416009), (55, 340371), (59, 317295), (99, 189095), (165, 113457), (177, 105765), (295, 63459), (495, 37819), (531, 35255), (641, 29205), (649, 28845), (885, 21153), (1923, 9735), (1947, 9615), (2655, 7051), (3205, 5841), (3245, 5769)]