19997540

素因数分解:

$2^2\times 5^1\times {\mathrm{691}}^1\times {\mathrm{1447}}^1$

素因数の和:2147

約数の個数: 24

約数和(自身を含む): 42084672

約数和(自身を除く): 22087132

約数列:

[1, 2, 4, 5, 10, 20, 691, 1382, 1447, 2764, 2894, 3455, 5788, 6910, 7235, 13820, 14470, 28940, 999877, 1999754, 3999508, 4999385, 9998770, 19997540]

約数ペア:

[(1, 19997540), (2, 9998770), (4, 4999385), (5, 3999508), (10, 1999754), (20, 999877), (691, 28940), (1382, 14470), (1447, 13820), (2764, 7235), (2894, 6910), (3455, 5788)]