781245

素因数分解:

$3^5\times 5^1\times {\mathrm{643}}^1$

素因数の和:663

約数の個数: 24

約数和(自身を含む): 1406496

約数和(自身を除く): 625251

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 243, 405, 643, 1215, 1929, 3215, 5787, 9645, 17361, 28935, 52083, 86805, 156249, 260415, 781245]

約数ペア:

[(1, 781245), (3, 260415), (5, 156249), (9, 86805), (15, 52083), (27, 28935), (45, 17361), (81, 9645), (135, 5787), (243, 3215), (405, 1929), (643, 1215)]