81636400

素因数分解:

$2^4\times 5^2\times {\mathrm{409}}^1\times {\mathrm{499}}^1$

素因数の和:926

約数の個数: 60

約数和(自身を含む): 197005000

約数和(自身を除く): 115368600

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 409, 499, 818, 998, 1636, 1996, 2045, 2495, 3272, 3992, 4090, 4990, 6544, 7984, 8180, 9980, 10225, 12475, 16360, 19960, 20450, 24950, 32720, 39920, 40900, 49900, 81800, 99800, 163600, 199600, 204091, 408182, 816364, 1020455, 1632728, 2040910, 3265456, 4081820, 5102275, 8163640, 10204550, 16327280, 20409100, 40818200, 81636400]

約数ペア:

[(1, 81636400), (2, 40818200), (4, 20409100), (5, 16327280), (8, 10204550), (10, 8163640), (16, 5102275), (20, 4081820), (25, 3265456), (40, 2040910), (50, 1632728), (80, 1020455), (100, 816364), (200, 408182), (400, 204091), (409, 199600), (499, 163600), (818, 99800), (998, 81800), (1636, 49900), (1996, 40900), (2045, 39920), (2495, 32720), (3272, 24950), (3992, 20450), (4090, 19960), (4990, 16360), (6544, 12475), (7984, 10225), (8180, 9980)]