20689991

素因数分解:

$7^1\times {\mathrm{83}}^1\times {\mathrm{149}}^1\times {\mathrm{239}}^1$

素因数の和:478

約数の個数: 16

約数和(自身を含む): 24192000

約数和(自身を除く): 3502009

約数列:

[1, 7, 83, 149, 239, 581, 1043, 1673, 12367, 19837, 35611, 86569, 138859, 249277, 2955713, 20689991]

約数ペア:

[(1, 20689991), (7, 2955713), (83, 249277), (149, 138859), (239, 86569), (581, 35611), (1043, 19837), (1673, 12367)]