20900900

素因数分解:

$2^2\times 5^2\times {\mathrm{47}}^1\times {\mathrm{4447}}^1$

素因数の和:4508

約数の個数: 36

約数和(自身を含む): 46330368

約数和(自身を除く): 25429468

約数列:

[1, 2, 4, 5, 10, 20, 25, 47, 50, 94, 100, 188, 235, 470, 940, 1175, 2350, 4447, 4700, 8894, 17788, 22235, 44470, 88940, 111175, 209009, 222350, 418018, 444700, 836036, 1045045, 2090090, 4180180, 5225225, 10450450, 20900900]

約数ペア:

[(1, 20900900), (2, 10450450), (4, 5225225), (5, 4180180), (10, 2090090), (20, 1045045), (25, 836036), (47, 444700), (50, 418018), (94, 222350), (100, 209009), (188, 111175), (235, 88940), (470, 44470), (940, 22235), (1175, 17788), (2350, 8894), (4447, 4700)]