19901800

素因数分解:

$2^3\times 5^2\times {\mathrm{151}}^1\times {\mathrm{659}}^1$

素因数の和:826

約数の個数: 48

約数和(自身を含む): 46648800

約数和(自身を除く): 26747000

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 151, 200, 302, 604, 659, 755, 1208, 1318, 1510, 2636, 3020, 3295, 3775, 5272, 6040, 6590, 7550, 13180, 15100, 16475, 26360, 30200, 32950, 65900, 99509, 131800, 199018, 398036, 497545, 796072, 995090, 1990180, 2487725, 3980360, 4975450, 9950900, 19901800]

約数ペア:

[(1, 19901800), (2, 9950900), (4, 4975450), (5, 3980360), (8, 2487725), (10, 1990180), (20, 995090), (25, 796072), (40, 497545), (50, 398036), (100, 199018), (151, 131800), (200, 99509), (302, 65900), (604, 32950), (659, 30200), (755, 26360), (1208, 16475), (1318, 15100), (1510, 13180), (2636, 7550), (3020, 6590), (3295, 6040), (3775, 5272)]