840631280

素因数分解:

$2^4\times 5^1\times {\mathrm{491}}^1\times {\mathrm{21401}}^1$

素因数の和:21905

約数の個数: 40

約数和(自身を含む): 1958539824

約数和(自身を除く): 1117908544

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 491, 982, 1964, 2455, 3928, 4910, 7856, 9820, 19640, 21401, 39280, 42802, 85604, 107005, 171208, 214010, 342416, 428020, 856040, 1712080, 10507891, 21015782, 42031564, 52539455, 84063128, 105078910, 168126256, 210157820, 420315640, 840631280]

約数ペア:

[(1, 840631280), (2, 420315640), (4, 210157820), (5, 168126256), (8, 105078910), (10, 84063128), (16, 52539455), (20, 42031564), (40, 21015782), (80, 10507891), (491, 1712080), (982, 856040), (1964, 428020), (2455, 342416), (3928, 214010), (4910, 171208), (7856, 107005), (9820, 85604), (19640, 42802), (21401, 39280)]