20981779

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{97}}^1\times {\mathrm{2377}}^1$

素因数の和:2494

約数の個数: 16

約数和(自身を含む): 26100928

約数和(自身を除く): 5119149

約数列:

[1, 7, 13, 91, 97, 679, 1261, 2377, 8827, 16639, 30901, 216307, 230569, 1613983, 2997397, 20981779]

約数ペア:

[(1, 20981779), (7, 2997397), (13, 1613983), (91, 230569), (97, 216307), (679, 30901), (1261, 16639), (2377, 8827)]