20998000

素因数分解:

$2^4\times 5^3\times {\mathrm{10499}}^1$

素因数の和:10522

約数の個数: 40

約数和(自身を含む): 50778000

約数和(自身を除く): 29780000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 125, 200, 250, 400, 500, 1000, 2000, 10499, 20998, 41996, 52495, 83992, 104990, 167984, 209980, 262475, 419960, 524950, 839920, 1049900, 1312375, 2099800, 2624750, 4199600, 5249500, 10499000, 20998000]

約数ペア:

[(1, 20998000), (2, 10499000), (4, 5249500), (5, 4199600), (8, 2624750), (10, 2099800), (16, 1312375), (20, 1049900), (25, 839920), (40, 524950), (50, 419960), (80, 262475), (100, 209980), (125, 167984), (200, 104990), (250, 83992), (400, 52495), (500, 41996), (1000, 20998), (2000, 10499)]