20901800

素因数分解:

$2^3\times 5^2\times {\mathrm{41}}^1\times {\mathrm{2549}}^1$

素因数の和:2606

約数の個数: 48

約数和(自身を含む): 49801500

約数和(自身を除く): 28899700

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 41, 50, 82, 100, 164, 200, 205, 328, 410, 820, 1025, 1640, 2050, 2549, 4100, 5098, 8200, 10196, 12745, 20392, 25490, 50980, 63725, 101960, 104509, 127450, 209018, 254900, 418036, 509800, 522545, 836072, 1045090, 2090180, 2612725, 4180360, 5225450, 10450900, 20901800]

約数ペア:

[(1, 20901800), (2, 10450900), (4, 5225450), (5, 4180360), (8, 2612725), (10, 2090180), (20, 1045090), (25, 836072), (40, 522545), (41, 509800), (50, 418036), (82, 254900), (100, 209018), (164, 127450), (200, 104509), (205, 101960), (328, 63725), (410, 50980), (820, 25490), (1025, 20392), (1640, 12745), (2050, 10196), (2549, 8200), (4100, 5098)]