21006945

素因数分解:

$3^4\times 5^1\times {\mathrm{51869}}^1$

素因数の和:51886

約数の個数: 20

約数和(自身を含む): 37657620

約数和(自身を除く): 16650675

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 51869, 155607, 259345, 466821, 778035, 1400463, 2334105, 4201389, 7002315, 21006945]

約数ペア:

[(1, 21006945), (3, 7002315), (5, 4201389), (9, 2334105), (15, 1400463), (27, 778035), (45, 466821), (81, 259345), (135, 155607), (405, 51869)]