21261305

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{271}}^1$

素因数の和:377

約数の個数: 32

約数和(自身を含む): 29611008

約数和(自身を除く): 8349703

約数列:

[1, 5, 13, 17, 65, 71, 85, 221, 271, 355, 923, 1105, 1207, 1355, 3523, 4607, 4615, 6035, 15691, 17615, 19241, 23035, 59891, 78455, 96205, 250133, 299455, 327097, 1250665, 1635485, 4252261, 21261305]

約数ペア:

[(1, 21261305), (5, 4252261), (13, 1635485), (17, 1250665), (65, 327097), (71, 299455), (85, 250133), (221, 96205), (271, 78455), (355, 59891), (923, 23035), (1105, 19241), (1207, 17615), (1355, 15691), (3523, 6035), (4607, 4615)]