20905209

素因数分解:

$3^4\times {\mathrm{13}}^1\times {\mathrm{19853}}^1$

素因数の和:19878

約数の個数: 20

約数和(自身を含む): 33632676

約数和(自身を除く): 12727467

約数列:

[1, 3, 9, 13, 27, 39, 81, 117, 351, 1053, 19853, 59559, 178677, 258089, 536031, 774267, 1608093, 2322801, 6968403, 20905209]

約数ペア:

[(1, 20905209), (3, 6968403), (9, 2322801), (13, 1608093), (27, 774267), (39, 536031), (81, 258089), (117, 178677), (351, 59559), (1053, 19853)]