657640

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{401}}^1$

素因数の和:453

約数の個数: 32

約数和(自身を含む): 1519560

約数和(自身を除く): 861920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 401, 410, 802, 820, 1604, 1640, 2005, 3208, 4010, 8020, 16040, 16441, 32882, 65764, 82205, 131528, 164410, 328820, 657640]

約数ペア:

[(1, 657640), (2, 328820), (4, 164410), (5, 131528), (8, 82205), (10, 65764), (20, 32882), (40, 16441), (41, 16040), (82, 8020), (164, 4010), (205, 3208), (328, 2005), (401, 1640), (410, 1604), (802, 820)]