21806915

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{131}}^1\times {\mathrm{197}}^1$

素因数の和:359

約数の個数: 24

約数和(自身を含む): 28697328

約数和(自身を除く): 6890413

約数列:

[1, 5, 13, 65, 131, 169, 197, 655, 845, 985, 1703, 2561, 8515, 12805, 22139, 25807, 33293, 110695, 129035, 166465, 335491, 1677455, 4361383, 21806915]

約数ペア:

[(1, 21806915), (5, 4361383), (13, 1677455), (65, 335491), (131, 166465), (169, 129035), (197, 110695), (655, 33293), (845, 25807), (985, 22139), (1703, 12805), (2561, 8515)]