21128991

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{11527}}^1$

素因数の和:11590

約数の個数: 16

約数和(自身を含む): 30987264

約数和(自身を除く): 9858273

約数列:

[1, 3, 13, 39, 47, 141, 611, 1833, 11527, 34581, 149851, 449553, 541769, 1625307, 7042997, 21128991]

約数ペア:

[(1, 21128991), (3, 7042997), (13, 1625307), (39, 541769), (47, 449553), (141, 149851), (611, 34581), (1833, 11527)]