19998981

素因数分解:

$3^4\times {\mathrm{37}}^1\times {\mathrm{6673}}^1$

素因数の和:6722

約数の個数: 20

約数和(自身を含む): 30687052

約数和(自身を除く): 10688071

約数列:

[1, 3, 9, 27, 37, 81, 111, 333, 999, 2997, 6673, 20019, 60057, 180171, 246901, 540513, 740703, 2222109, 6666327, 19998981]

約数ペア:

[(1, 19998981), (3, 6666327), (9, 2222109), (27, 740703), (37, 540513), (81, 246901), (111, 180171), (333, 60057), (999, 20019), (2997, 6673)]