20989989

素因数分解:

$3^3\times {\mathrm{37}}^1\times {\mathrm{21011}}^1$

素因数の和:21057

約数の個数: 16

約数和(自身を含む): 31938240

約数和(自身を除く): 10948251

約数列:

[1, 3, 9, 27, 37, 111, 333, 999, 21011, 63033, 189099, 567297, 777407, 2332221, 6996663, 20989989]

約数ペア:

[(1, 20989989), (3, 6996663), (9, 2332221), (27, 777407), (37, 567297), (111, 189099), (333, 63033), (999, 21011)]