39920000

素因数分解:

$2^7\times 5^4\times {\mathrm{499}}^1$

素因数の和:533

約数の個数: 80

約数和(自身を含む): 99577500

約数和(自身を除く): 59657500

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 128, 160, 200, 250, 320, 400, 499, 500, 625, 640, 800, 998, 1000, 1250, 1600, 1996, 2000, 2495, 2500, 3200, 3992, 4000, 4990, 5000, 7984, 8000, 9980, 10000, 12475, 15968, 16000, 19960, 20000, 24950, 31936, 39920, 40000, 49900, 62375, 63872, 79840, 80000, 99800, 124750, 159680, 199600, 249500, 311875, 319360, 399200, 499000, 623750, 798400, 998000, 1247500, 1596800, 1996000, 2495000, 3992000, 4990000, 7984000, 9980000, 19960000, 39920000]

約数ペア:

[(1, 39920000), (2, 19960000), (4, 9980000), (5, 7984000), (8, 4990000), (10, 3992000), (16, 2495000), (20, 1996000), (25, 1596800), (32, 1247500), (40, 998000), (50, 798400), (64, 623750), (80, 499000), (100, 399200), (125, 319360), (128, 311875), (160, 249500), (200, 199600), (250, 159680), (320, 124750), (400, 99800), (499, 80000), (500, 79840), (625, 63872), (640, 62375), (800, 49900), (998, 40000), (1000, 39920), (1250, 31936), (1600, 24950), (1996, 20000), (2000, 19960), (2495, 16000), (2500, 15968), (3200, 12475), (3992, 10000), (4000, 9980), (4990, 8000), (5000, 7984)]