19902980

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{23143}}^1$

素因数の和:23195

約数の個数: 24

約数和(自身を含む): 42770112

約数和(自身を除く): 22867132

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 172, 215, 430, 860, 23143, 46286, 92572, 115715, 231430, 462860, 995149, 1990298, 3980596, 4975745, 9951490, 19902980]

約数ペア:

[(1, 19902980), (2, 9951490), (4, 4975745), (5, 3980596), (10, 1990298), (20, 995149), (43, 462860), (86, 231430), (172, 115715), (215, 92572), (430, 46286), (860, 23143)]