20991503

素因数分解:

${\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{103}}^1\times {\mathrm{257}}^1$

素因数の和:434

約数の個数: 16

約数和(自身を含む): 23290176

約数和(自身を除く): 2298673

約数列:

[1, 13, 61, 103, 257, 793, 1339, 3341, 6283, 15677, 26471, 81679, 203801, 344123, 1614731, 20991503]

約数ペア:

[(1, 20991503), (13, 1614731), (61, 344123), (103, 203801), (257, 81679), (793, 26471), (1339, 15677), (3341, 6283)]