21991489

素因数分解:

${\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{151}}^1\times {\mathrm{659}}^1$

素因数の和:840

約数の個数: 16

約数和(自身を含む): 25280640

約数和(自身を除く): 3289151

約数列:

[1, 13, 17, 151, 221, 659, 1963, 2567, 8567, 11203, 33371, 99509, 145639, 1293617, 1691653, 21991489]

約数ペア:

[(1, 21991489), (13, 1691653), (17, 1293617), (151, 145639), (221, 99509), (659, 33371), (1963, 11203), (2567, 8567)]