1640090

素因数分解:

$2^1\times 5^1\times {\mathrm{401}}^1\times {\mathrm{409}}^1$

素因数の和:817

約数の個数: 16

約数和(自身を含む): 2966760

約数和(自身を除く): 1326670

約数列:

[1, 2, 5, 10, 401, 409, 802, 818, 2005, 2045, 4010, 4090, 164009, 328018, 820045, 1640090]

約数ペア:

[(1, 1640090), (2, 820045), (5, 328018), (10, 164009), (401, 4090), (409, 4010), (802, 2045), (818, 2005)]