71998787

素因数分解:

$7^4\times {\mathrm{157}}^1\times {\mathrm{191}}^1$

素因数の和:376

約数の個数: 20

約数和(自身を含む): 84971136

約数和(自身を除く): 12972349

約数列:

[1, 7, 49, 157, 191, 343, 1099, 1337, 2401, 7693, 9359, 29987, 53851, 65513, 209909, 376957, 458591, 1469363, 10285541, 71998787]

約数ペア:

[(1, 71998787), (7, 10285541), (49, 1469363), (157, 458591), (191, 376957), (343, 209909), (1099, 65513), (1337, 53851), (2401, 29987), (7693, 9359)]