20811915

素因数分解:

$3^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{4243}}^1$

素因数の和:4363

約数の個数: 24

約数和(自身を含む): 36413520

約数和(自身を除く): 15601605

約数列:

[1, 3, 5, 9, 15, 45, 109, 327, 545, 981, 1635, 4243, 4905, 12729, 21215, 38187, 63645, 190935, 462487, 1387461, 2312435, 4162383, 6937305, 20811915]

約数ペア:

[(1, 20811915), (3, 6937305), (5, 4162383), (9, 2312435), (15, 1387461), (45, 462487), (109, 190935), (327, 63645), (545, 38187), (981, 21215), (1635, 12729), (4243, 4905)]