19999900

素因数分解:

$2^2\times 5^2\times {\mathrm{199999}}^1$

素因数の和:200013

約数の個数: 18

約数和(自身を含む): 43400000

約数和(自身を除く): 23400100

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 199999, 399998, 799996, 999995, 1999990, 3999980, 4999975, 9999950, 19999900]

約数ペア:

[(1, 19999900), (2, 9999950), (4, 4999975), (5, 3999980), (10, 1999990), (20, 999995), (25, 799996), (50, 399998), (100, 199999)]