4980020

素因数分解:

$2^2\times 5^1\times {\mathrm{499}}^2$

素因数の和:1007

約数の個数: 18

約数和(自身を含む): 10479042

約数和(自身を除く): 5499022

約数列:

[1, 2, 4, 5, 10, 20, 499, 998, 1996, 2495, 4990, 9980, 249001, 498002, 996004, 1245005, 2490010, 4980020]

約数ペア:

[(1, 4980020), (2, 2490010), (4, 1245005), (5, 996004), (10, 498002), (20, 249001), (499, 9980), (998, 4990), (1996, 2495)]