21078213

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{12569}}^1$

素因数の和:12628

約数の個数: 16

約数和(自身を含む): 30972480

約数和(自身を除く): 9894267

約数列:

[1, 3, 13, 39, 43, 129, 559, 1677, 12569, 37707, 163397, 490191, 540467, 1621401, 7026071, 21078213]

約数ペア:

[(1, 21078213), (3, 7026071), (13, 1621401), (39, 540467), (43, 490191), (129, 163397), (559, 37707), (1677, 12569)]