21720413

素因数分解:

${\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{193}}^1\times {\mathrm{787}}^1$

素因数の和:1004

約数の個数: 16

約数和(自身を含む): 25682496

約数和(自身を除く): 3962083

約数列:

[1, 11, 13, 143, 193, 787, 2123, 2509, 8657, 10231, 27599, 112541, 151891, 1670801, 1974583, 21720413]

約数ペア:

[(1, 21720413), (11, 1974583), (13, 1670801), (143, 151891), (193, 112541), (787, 27599), (2123, 10231), (2509, 8657)]