19991855

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{59}}^1\times {\mathrm{401}}^1$

素因数の和:491

約数の個数: 24

約数和(自身を含む): 26483760

約数和(自身を除く): 6491905

約数列:

[1, 5, 13, 59, 65, 169, 295, 401, 767, 845, 2005, 3835, 5213, 9971, 23659, 26065, 49855, 67769, 118295, 307567, 338845, 1537835, 3998371, 19991855]

約数ペア:

[(1, 19991855), (5, 3998371), (13, 1537835), (59, 338845), (65, 307567), (169, 118295), (295, 67769), (401, 49855), (767, 26065), (845, 23659), (2005, 9971), (3835, 5213)]