21007779

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{12527}}^1$

素因数の和:12586

約数の個数: 16

約数和(自身を含む): 30868992

約数和(自身を除く): 9861213

約数列:

[1, 3, 13, 39, 43, 129, 559, 1677, 12527, 37581, 162851, 488553, 538661, 1615983, 7002593, 21007779]

約数ペア:

[(1, 21007779), (3, 7002593), (13, 1615983), (39, 538661), (43, 488553), (129, 162851), (559, 37581), (1677, 12527)]