21565804

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{641}}^1\times {\mathrm{647}}^1$

素因数の和:1305

約数の個数: 24

約数和(自身を含む): 40769568

約数和(自身を除く): 19203764

約数列:

[1, 2, 4, 13, 26, 52, 641, 647, 1282, 1294, 2564, 2588, 8333, 8411, 16666, 16822, 33332, 33644, 414727, 829454, 1658908, 5391451, 10782902, 21565804]

約数ペア:

[(1, 21565804), (2, 10782902), (4, 5391451), (13, 1658908), (26, 829454), (52, 414727), (641, 33644), (647, 33332), (1282, 16822), (1294, 16666), (2564, 8411), (2588, 8333)]