21490989

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{643}}^1\times {\mathrm{857}}^1$

素因数の和:1516

約数の個数: 16

約数和(自身を含む): 30942912

約数和(自身を除く): 9451923

約数列:

[1, 3, 13, 39, 643, 857, 1929, 2571, 8359, 11141, 25077, 33423, 551051, 1653153, 7163663, 21490989]

約数ペア:

[(1, 21490989), (3, 7163663), (13, 1653153), (39, 551051), (643, 33423), (857, 25077), (1929, 11141), (2571, 8359)]