21380679

素因数分解:

$3^4\times {\mathrm{17}}^1\times {\mathrm{15527}}^1$

素因数の和:15556

約数の個数: 20

約数和(自身を含む): 33819984

約数和(自身を除く): 12439305

約数列:

[1, 3, 9, 17, 27, 51, 81, 153, 459, 1377, 15527, 46581, 139743, 263959, 419229, 791877, 1257687, 2375631, 7126893, 21380679]

約数ペア:

[(1, 21380679), (3, 7126893), (9, 2375631), (17, 1257687), (27, 791877), (51, 419229), (81, 263959), (153, 139743), (459, 46581), (1377, 15527)]