21000555

素因数分解:

$3^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{10853}}^1$

素因数の和:10907

約数の個数: 24

約数和(自身を含む): 37250928

約数和(自身を除く): 16250373

約数列:

[1, 3, 5, 9, 15, 43, 45, 129, 215, 387, 645, 1935, 10853, 32559, 54265, 97677, 162795, 466679, 488385, 1400037, 2333395, 4200111, 7000185, 21000555]

約数ペア:

[(1, 21000555), (3, 7000185), (5, 4200111), (9, 2333395), (15, 1400037), (43, 488385), (45, 466679), (129, 162795), (215, 97677), (387, 54265), (645, 32559), (1935, 10853)]