20991987

素因数分解:

$3^3\times {\mathrm{37}}^1\times {\mathrm{21013}}^1$

素因数の和:21059

約数の個数: 16

約数和(自身を含む): 31941280

約数和(自身を除く): 10949293

約数列:

[1, 3, 9, 27, 37, 111, 333, 999, 21013, 63039, 189117, 567351, 777481, 2332443, 6997329, 20991987]

約数ペア:

[(1, 20991987), (3, 6997329), (9, 2332443), (27, 777481), (37, 567351), (111, 189117), (333, 63039), (999, 21013)]