20641985

素因数分解:

$5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{6481}}^1$

素因数の和:6513

約数の個数: 24

約数和(自身を含む): 31035816

約数和(自身を除く): 10393831

約数列:

[1, 5, 7, 13, 35, 49, 65, 91, 245, 455, 637, 3185, 6481, 32405, 45367, 84253, 226835, 317569, 421265, 589771, 1587845, 2948855, 4128397, 20641985]

約数ペア:

[(1, 20641985), (5, 4128397), (7, 2948855), (13, 1587845), (35, 589771), (49, 421265), (65, 317569), (91, 226835), (245, 84253), (455, 45367), (637, 32405), (3185, 6481)]