21408140

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{82339}}^1$

素因数の和:82361

約数の個数: 24

約数和(自身を含む): 48415920

約数和(自身を除く): 27007780

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 82339, 164678, 329356, 411695, 823390, 1070407, 1646780, 2140814, 4281628, 5352035, 10704070, 21408140]

約数ペア:

[(1, 21408140), (2, 10704070), (4, 5352035), (5, 4281628), (10, 2140814), (13, 1646780), (20, 1070407), (26, 823390), (52, 411695), (65, 329356), (130, 164678), (260, 82339)]