21305510

素因数分解:

$2^1\times 5^1\times {\mathrm{79}}^1\times {\mathrm{149}}^1\times {\mathrm{181}}^1$

素因数の和:416

約数の個数: 32

約数和(自身を含む): 39312000

約数和(自身を除く): 18006490

約数列:

[1, 2, 5, 10, 79, 149, 158, 181, 298, 362, 395, 745, 790, 905, 1490, 1810, 11771, 14299, 23542, 26969, 28598, 53938, 58855, 71495, 117710, 134845, 142990, 269690, 2130551, 4261102, 10652755, 21305510]

約数ペア:

[(1, 21305510), (2, 10652755), (5, 4261102), (10, 2130551), (79, 269690), (149, 142990), (158, 134845), (181, 117710), (298, 71495), (362, 58855), (395, 53938), (745, 28598), (790, 26969), (905, 23542), (1490, 14299), (1810, 11771)]