18978980

素因数分解:

$2^2\times 5^1\times {\mathrm{197}}^1\times {\mathrm{4817}}^1$

素因数の和:5023

約数の個数: 24

約数和(自身を含む): 40066488

約数和(自身を除く): 21087508

約数列:

[1, 2, 4, 5, 10, 20, 197, 394, 788, 985, 1970, 3940, 4817, 9634, 19268, 24085, 48170, 96340, 948949, 1897898, 3795796, 4744745, 9489490, 18978980]

約数ペア:

[(1, 18978980), (2, 9489490), (4, 4744745), (5, 3795796), (10, 1897898), (20, 948949), (197, 96340), (394, 48170), (788, 24085), (985, 19268), (1970, 9634), (3940, 4817)]