81291460

素因数分解:

$2^2\times 5^1\times {\mathrm{157}}^1\times {\mathrm{25889}}^1$

素因数の和:26055

約数の個数: 24

約数和(自身を含む): 171806040

約数和(自身を除く): 90514580

約数列:

[1, 2, 4, 5, 10, 20, 157, 314, 628, 785, 1570, 3140, 25889, 51778, 103556, 129445, 258890, 517780, 4064573, 8129146, 16258292, 20322865, 40645730, 81291460]

約数ペア:

[(1, 81291460), (2, 40645730), (4, 20322865), (5, 16258292), (10, 8129146), (20, 4064573), (157, 517780), (314, 258890), (628, 129445), (785, 103556), (1570, 51778), (3140, 25889)]