18756815

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^2\times {\mathrm{43}}^1\times {\mathrm{103}}^1$

素因数の和:180

約数の個数: 48

約数和(自身を含む): 29213184

約数和(自身を除く): 10456369

約数列:

[1, 5, 7, 11, 35, 43, 55, 77, 103, 121, 215, 301, 385, 473, 515, 605, 721, 847, 1133, 1505, 2365, 3311, 3605, 4235, 4429, 5203, 5665, 7931, 12463, 16555, 22145, 26015, 31003, 36421, 39655, 48719, 62315, 87241, 155015, 182105, 243595, 341033, 436205, 535909, 1705165, 2679545, 3751363, 18756815]

約数ペア:

[(1, 18756815), (5, 3751363), (7, 2679545), (11, 1705165), (35, 535909), (43, 436205), (55, 341033), (77, 243595), (103, 182105), (121, 155015), (215, 87241), (301, 62315), (385, 48719), (473, 39655), (515, 36421), (605, 31003), (721, 26015), (847, 22145), (1133, 16555), (1505, 12463), (2365, 7931), (3311, 5665), (3605, 5203), (4235, 4429)]