20991399

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{167}}^1\times {\mathrm{293}}^1$

素因数の和:487

約数の個数: 32

約数和(自身を含む): 33191424

約数和(自身を除く): 12200025

約数列:

[1, 3, 11, 13, 33, 39, 143, 167, 293, 429, 501, 879, 1837, 2171, 3223, 3809, 5511, 6513, 9669, 11427, 23881, 41899, 48931, 71643, 125697, 146793, 538241, 636103, 1614723, 1908309, 6997133, 20991399]

約数ペア:

[(1, 20991399), (3, 6997133), (11, 1908309), (13, 1614723), (33, 636103), (39, 538241), (143, 146793), (167, 125697), (293, 71643), (429, 48931), (501, 41899), (879, 23881), (1837, 11427), (2171, 9669), (3223, 6513), (3809, 5511)]