21490839

素因数分解:

$3^4\times {\mathrm{17}}^1\times {\mathrm{15607}}^1$

素因数の和:15636

約数の個数: 20

約数和(自身を含む): 33994224

約数和(自身を除く): 12503385

約数列:

[1, 3, 9, 17, 27, 51, 81, 153, 459, 1377, 15607, 46821, 140463, 265319, 421389, 795957, 1264167, 2387871, 7163613, 21490839]

約数ペア:

[(1, 21490839), (3, 7163613), (9, 2387871), (17, 1264167), (27, 795957), (51, 421389), (81, 265319), (153, 140463), (459, 46821), (1377, 15607)]