21005678

素因数分解:

$2^1\times {\mathrm{19}}^1\times {\mathrm{521}}^1\times {\mathrm{1061}}^1$

素因数の和:1603

約数の個数: 16

約数和(自身を含む): 33261840

約数和(自身を除く): 12256162

約数列:

[1, 2, 19, 38, 521, 1042, 1061, 2122, 9899, 19798, 20159, 40318, 552781, 1105562, 10502839, 21005678]

約数ペア:

[(1, 21005678), (2, 10502839), (19, 1105562), (38, 552781), (521, 40318), (1042, 20159), (1061, 19798), (2122, 9899)]