21287255

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{349}}^1\times {\mathrm{1109}}^1$

素因数の和:1474

約数の個数: 16

約数和(自身を含む): 27972000

約数和(自身を除く): 6684745

約数列:

[1, 5, 11, 55, 349, 1109, 1745, 3839, 5545, 12199, 19195, 60995, 387041, 1935205, 4257451, 21287255]

約数ペア:

[(1, 21287255), (5, 4257451), (11, 1935205), (55, 387041), (349, 60995), (1109, 19195), (1745, 12199), (3839, 5545)]