21978945

素因数分解:

$3^4\times 5^1\times {\mathrm{54269}}^1$

素因数の和:54286

約数の個数: 20

約数和(自身を含む): 39400020

約数和(自身を除く): 17421075

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 54269, 162807, 271345, 488421, 814035, 1465263, 2442105, 4395789, 7326315, 21978945]

約数ペア:

[(1, 21978945), (3, 7326315), (5, 4395789), (9, 2442105), (15, 1465263), (27, 814035), (45, 488421), (81, 271345), (135, 162807), (405, 54269)]