20881861

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{907}}^1$

素因数の和:961

約数の個数: 32

約数和(自身を含む): 29288448

約数和(自身を除く): 8406587

約数列:

[1, 7, 11, 13, 23, 77, 91, 143, 161, 253, 299, 907, 1001, 1771, 2093, 3289, 6349, 9977, 11791, 20861, 23023, 69839, 82537, 129701, 146027, 229471, 271193, 907907, 1606297, 1898351, 2983123, 20881861]

約数ペア:

[(1, 20881861), (7, 2983123), (11, 1898351), (13, 1606297), (23, 907907), (77, 271193), (91, 229471), (143, 146027), (161, 129701), (253, 82537), (299, 69839), (907, 23023), (1001, 20861), (1771, 11791), (2093, 9977), (3289, 6349)]