20991230

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{161471}}^1$

素因数の和:161491

約数の個数: 16

約数和(自身を含む): 40690944

約数和(自身を除く): 19699714

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 161471, 322942, 807355, 1614710, 2099123, 4198246, 10495615, 20991230]

約数ペア:

[(1, 20991230), (2, 10495615), (5, 4198246), (10, 2099123), (13, 1614710), (26, 807355), (65, 322942), (130, 161471)]