21719644

素因数分解:

$2^2\times {\mathrm{43}}^1\times {\mathrm{197}}^1\times {\mathrm{641}}^1$

素因数の和:885

約数の個数: 24

約数和(自身を含む): 39151728

約数和(自身を除く): 17432084

約数列:

[1, 2, 4, 43, 86, 172, 197, 394, 641, 788, 1282, 2564, 8471, 16942, 27563, 33884, 55126, 110252, 126277, 252554, 505108, 5429911, 10859822, 21719644]

約数ペア:

[(1, 21719644), (2, 10859822), (4, 5429911), (43, 505108), (86, 252554), (172, 126277), (197, 110252), (394, 55126), (641, 33884), (788, 27563), (1282, 16942), (2564, 8471)]