20400500

素因数分解:

$2^2\times 5^3\times {\mathrm{40801}}^1$

素因数の和:40820

約数の個数: 24

約数和(自身を含む): 44555784

約数和(自身を除く): 24155284

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 125, 250, 500, 40801, 81602, 163204, 204005, 408010, 816020, 1020025, 2040050, 4080100, 5100125, 10200250, 20400500]

約数ペア:

[(1, 20400500), (2, 10200250), (4, 5100125), (5, 4080100), (10, 2040050), (20, 1020025), (25, 816020), (50, 408010), (100, 204005), (125, 163204), (250, 81602), (500, 40801)]