211005

素因数分解:

$3^4\times 5^1\times {\mathrm{521}}^1$

素因数の和:538

約数の個数: 20

約数和(自身を含む): 378972

約数和(自身を除く): 167967

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 521, 1563, 2605, 4689, 7815, 14067, 23445, 42201, 70335, 211005]

約数ペア:

[(1, 211005), (3, 70335), (5, 42201), (9, 23445), (15, 14067), (27, 7815), (45, 4689), (81, 2605), (135, 1563), (405, 521)]