20181555

素因数分解:

$3^4\times 5^1\times {\mathrm{49831}}^1$

素因数の和:49848

約数の個数: 20

約数和(自身を含む): 36178032

約数和(自身を除く): 15996477

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 49831, 149493, 249155, 448479, 747465, 1345437, 2242395, 4036311, 6727185, 20181555]

約数ペア:

[(1, 20181555), (3, 6727185), (5, 4036311), (9, 2242395), (15, 1345437), (27, 747465), (45, 448479), (81, 249155), (135, 149493), (405, 49831)]