20531800

素因数分解:

$2^3\times 5^2\times {\mathrm{251}}^1\times {\mathrm{409}}^1$

素因数の和:676

約数の個数: 48

約数和(自身を含む): 48043800

約数和(自身を除く): 27512000

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200, 251, 409, 502, 818, 1004, 1255, 1636, 2008, 2045, 2510, 3272, 4090, 5020, 6275, 8180, 10040, 10225, 12550, 16360, 20450, 25100, 40900, 50200, 81800, 102659, 205318, 410636, 513295, 821272, 1026590, 2053180, 2566475, 4106360, 5132950, 10265900, 20531800]

約数ペア:

[(1, 20531800), (2, 10265900), (4, 5132950), (5, 4106360), (8, 2566475), (10, 2053180), (20, 1026590), (25, 821272), (40, 513295), (50, 410636), (100, 205318), (200, 102659), (251, 81800), (409, 50200), (502, 40900), (818, 25100), (1004, 20450), (1255, 16360), (1636, 12550), (2008, 10225), (2045, 10040), (2510, 8180), (3272, 6275), (4090, 5020)]