21187815

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{128411}}^1$

素因数の和:128430

約数の個数: 16

約数和(自身を含む): 36982656

約数和(自身を除く): 15794841

約数列:

[1, 3, 5, 11, 15, 33, 55, 165, 128411, 385233, 642055, 1412521, 1926165, 4237563, 7062605, 21187815]

約数ペア:

[(1, 21187815), (3, 7062605), (5, 4237563), (11, 1926165), (15, 1412521), (33, 642055), (55, 385233), (165, 128411)]