21378955

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{7649}}^1$

素因数の和:7710

約数の個数: 16

約数和(自身を含む): 28274400

約数和(自身を除く): 6895445

約数列:

[1, 5, 13, 43, 65, 215, 559, 2795, 7649, 38245, 99437, 328907, 497185, 1644535, 4275791, 21378955]

約数ペア:

[(1, 21378955), (5, 4275791), (13, 1644535), (43, 497185), (65, 328907), (215, 99437), (559, 38245), (2795, 7649)]