81778815

素因数分解:

$3^4\times 5^1\times {\mathrm{201923}}^1$

素因数の和:201940

約数の個数: 20

約数和(自身を含む): 146596824

約数和(自身を除く): 64818009

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 201923, 605769, 1009615, 1817307, 3028845, 5451921, 9086535, 16355763, 27259605, 81778815]

約数ペア:

[(1, 81778815), (3, 27259605), (5, 16355763), (9, 9086535), (15, 5451921), (27, 3028845), (45, 1817307), (81, 1009615), (135, 605769), (405, 201923)]