19802000

素因数分解:

$2^4\times 5^3\times {\mathrm{9901}}^1$

素因数の和:9924

約数の個数: 40

約数和(自身を含む): 47886072

約数和(自身を除く): 28084072

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 125, 200, 250, 400, 500, 1000, 2000, 9901, 19802, 39604, 49505, 79208, 99010, 158416, 198020, 247525, 396040, 495050, 792080, 990100, 1237625, 1980200, 2475250, 3960400, 4950500, 9901000, 19802000]

約数ペア:

[(1, 19802000), (2, 9901000), (4, 4950500), (5, 3960400), (8, 2475250), (10, 1980200), (16, 1237625), (20, 990100), (25, 792080), (40, 495050), (50, 396040), (80, 247525), (100, 198020), (125, 158416), (200, 99010), (250, 79208), (400, 49505), (500, 39604), (1000, 19802), (2000, 9901)]