1999100

素因数分解:

$2^2\times 5^2\times {\mathrm{19991}}^1$

素因数の和:20005

約数の個数: 18

約数和(自身を含む): 4338264

約数和(自身を除く): 2339164

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 19991, 39982, 79964, 99955, 199910, 399820, 499775, 999550, 1999100]

約数ペア:

[(1, 1999100), (2, 999550), (4, 499775), (5, 399820), (10, 199910), (20, 99955), (25, 79964), (50, 39982), (100, 19991)]