20659340

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{181}}^1\times {\mathrm{439}}^1$

素因数の和:642

約数の個数: 48

約数和(自身を含む): 47087040

約数和(自身を除く): 26427700

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 181, 260, 362, 439, 724, 878, 905, 1756, 1810, 2195, 2353, 3620, 4390, 4706, 5707, 8780, 9412, 11414, 11765, 22828, 23530, 28535, 47060, 57070, 79459, 114140, 158918, 317836, 397295, 794590, 1032967, 1589180, 2065934, 4131868, 5164835, 10329670, 20659340]

約数ペア:

[(1, 20659340), (2, 10329670), (4, 5164835), (5, 4131868), (10, 2065934), (13, 1589180), (20, 1032967), (26, 794590), (52, 397295), (65, 317836), (130, 158918), (181, 114140), (260, 79459), (362, 57070), (439, 47060), (724, 28535), (878, 23530), (905, 22828), (1756, 11765), (1810, 11414), (2195, 9412), (2353, 8780), (3620, 5707), (4390, 4706)]