20985885

素因数分解:

$3^4\times 5^1\times {\mathrm{51817}}^1$

素因数の和:51834

約数の個数: 20

約数和(自身を含む): 37619868

約数和(自身を除く): 16633983

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 51817, 155451, 259085, 466353, 777255, 1399059, 2331765, 4197177, 6995295, 20985885]

約数ペア:

[(1, 20985885), (3, 6995295), (5, 4197177), (9, 2331765), (15, 1399059), (27, 777255), (45, 466353), (81, 259085), (135, 155451), (405, 51817)]