20838040

素因数分解:

$2^3\times 5^1\times {\mathrm{491}}^1\times {\mathrm{1061}}^1$

素因数の和:1563

約数の個数: 32

約数和(自身を含む): 47025360

約数和(自身を除く): 26187320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 491, 982, 1061, 1964, 2122, 2455, 3928, 4244, 4910, 5305, 8488, 9820, 10610, 19640, 21220, 42440, 520951, 1041902, 2083804, 2604755, 4167608, 5209510, 10419020, 20838040]

約数ペア:

[(1, 20838040), (2, 10419020), (4, 5209510), (5, 4167608), (8, 2604755), (10, 2083804), (20, 1041902), (40, 520951), (491, 42440), (982, 21220), (1061, 19640), (1964, 10610), (2122, 9820), (2455, 8488), (3928, 5305), (4244, 4910)]