20408000

素因数分解:

$2^6\times 5^3\times {\mathrm{2551}}^1$

素因数の和:2578

約数の個数: 56

約数和(自身を含む): 50560224

約数和(自身を除く): 30152224

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 160, 200, 250, 320, 400, 500, 800, 1000, 1600, 2000, 2551, 4000, 5102, 8000, 10204, 12755, 20408, 25510, 40816, 51020, 63775, 81632, 102040, 127550, 163264, 204080, 255100, 318875, 408160, 510200, 637750, 816320, 1020400, 1275500, 2040800, 2551000, 4081600, 5102000, 10204000, 20408000]

約数ペア:

[(1, 20408000), (2, 10204000), (4, 5102000), (5, 4081600), (8, 2551000), (10, 2040800), (16, 1275500), (20, 1020400), (25, 816320), (32, 637750), (40, 510200), (50, 408160), (64, 318875), (80, 255100), (100, 204080), (125, 163264), (160, 127550), (200, 102040), (250, 81632), (320, 63775), (400, 51020), (500, 40816), (800, 25510), (1000, 20408), (1600, 12755), (2000, 10204), (2551, 8000), (4000, 5102)]