21990400

素因数分解:

$2^{10}\times 5^2\times {\mathrm{859}}^1$

素因数の和:889

約数の個数: 66

約数和(自身を含む): 54573020

約数和(自身を除く): 32582620

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 128, 160, 200, 256, 320, 400, 512, 640, 800, 859, 1024, 1280, 1600, 1718, 2560, 3200, 3436, 4295, 5120, 6400, 6872, 8590, 12800, 13744, 17180, 21475, 25600, 27488, 34360, 42950, 54976, 68720, 85900, 109952, 137440, 171800, 219904, 274880, 343600, 439808, 549760, 687200, 879616, 1099520, 1374400, 2199040, 2748800, 4398080, 5497600, 10995200, 21990400]

約数ペア:

[(1, 21990400), (2, 10995200), (4, 5497600), (5, 4398080), (8, 2748800), (10, 2199040), (16, 1374400), (20, 1099520), (25, 879616), (32, 687200), (40, 549760), (50, 439808), (64, 343600), (80, 274880), (100, 219904), (128, 171800), (160, 137440), (200, 109952), (256, 85900), (320, 68720), (400, 54976), (512, 42950), (640, 34360), (800, 27488), (859, 25600), (1024, 21475), (1280, 17180), (1600, 13744), (1718, 12800), (2560, 8590), (3200, 6872), (3436, 6400), (4295, 5120)]