64807580

素因数分解:

$2^2\times 5^1\times {\mathrm{1621}}^1\times {\mathrm{1999}}^1$

素因数の和:3629

約数の個数: 24

約数和(自身を含む): 136248000

約数和(自身を除く): 71440420

約数列:

[1, 2, 4, 5, 10, 20, 1621, 1999, 3242, 3998, 6484, 7996, 8105, 9995, 16210, 19990, 32420, 39980, 3240379, 6480758, 12961516, 16201895, 32403790, 64807580]

約数ペア:

[(1, 64807580), (2, 32403790), (4, 16201895), (5, 12961516), (10, 6480758), (20, 3240379), (1621, 39980), (1999, 32420), (3242, 19990), (3998, 16210), (6484, 9995), (7996, 8105)]