79999820

素因数分解:

$2^2\times 5^1\times {\mathrm{1997}}^1\times {\mathrm{2003}}^1$

素因数の和:4009

約数の個数: 24

約数和(自身を含む): 168167664

約数和(自身を除く): 88167844

約数列:

[1, 2, 4, 5, 10, 20, 1997, 2003, 3994, 4006, 7988, 8012, 9985, 10015, 19970, 20030, 39940, 40060, 3999991, 7999982, 15999964, 19999955, 39999910, 79999820]

約数ペア:

[(1, 79999820), (2, 39999910), (4, 19999955), (5, 15999964), (10, 7999982), (20, 3999991), (1997, 40060), (2003, 39940), (3994, 20030), (4006, 19970), (7988, 10015), (8012, 9985)]