20979999

素因数分解:

$3^3\times {\mathrm{37}}^1\times {\mathrm{21001}}^1$

素因数の和:21047

約数の個数: 16

約数和(自身を含む): 31923040

約数和(自身を除く): 10943041

約数列:

[1, 3, 9, 27, 37, 111, 333, 999, 21001, 63003, 189009, 567027, 777037, 2331111, 6993333, 20979999]

約数ペア:

[(1, 20979999), (3, 6993333), (9, 2331111), (27, 777037), (37, 567027), (111, 189009), (333, 63003), (999, 21001)]