20981997

素因数分解:

$3^4\times {\mathrm{37}}^1\times {\mathrm{7001}}^1$

素因数の和:7050

約数の個数: 20

約数和(自身を含む): 32195196

約数和(自身を除く): 11213199

約数列:

[1, 3, 9, 27, 37, 81, 111, 333, 999, 2997, 7001, 21003, 63009, 189027, 259037, 567081, 777111, 2331333, 6993999, 20981997]

約数ペア:

[(1, 20981997), (3, 6993999), (9, 2331333), (27, 777111), (37, 567081), (81, 259037), (111, 189027), (333, 63009), (999, 21003), (2997, 7001)]