79840000

素因数分解:

$2^8\times 5^4\times {\mathrm{499}}^1$

素因数の和:535

約数の個数: 90

約数和(自身を含む): 199545500

約数和(自身を除く): 119705500

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 128, 160, 200, 250, 256, 320, 400, 499, 500, 625, 640, 800, 998, 1000, 1250, 1280, 1600, 1996, 2000, 2495, 2500, 3200, 3992, 4000, 4990, 5000, 6400, 7984, 8000, 9980, 10000, 12475, 15968, 16000, 19960, 20000, 24950, 31936, 32000, 39920, 40000, 49900, 62375, 63872, 79840, 80000, 99800, 124750, 127744, 159680, 160000, 199600, 249500, 311875, 319360, 399200, 499000, 623750, 638720, 798400, 998000, 1247500, 1596800, 1996000, 2495000, 3193600, 3992000, 4990000, 7984000, 9980000, 15968000, 19960000, 39920000, 79840000]

約数ペア:

[(1, 79840000), (2, 39920000), (4, 19960000), (5, 15968000), (8, 9980000), (10, 7984000), (16, 4990000), (20, 3992000), (25, 3193600), (32, 2495000), (40, 1996000), (50, 1596800), (64, 1247500), (80, 998000), (100, 798400), (125, 638720), (128, 623750), (160, 499000), (200, 399200), (250, 319360), (256, 311875), (320, 249500), (400, 199600), (499, 160000), (500, 159680), (625, 127744), (640, 124750), (800, 99800), (998, 80000), (1000, 79840), (1250, 63872), (1280, 62375), (1600, 49900), (1996, 40000), (2000, 39920), (2495, 32000), (2500, 31936), (3200, 24950), (3992, 20000), (4000, 19960), (4990, 16000), (5000, 15968), (6400, 12475), (7984, 10000), (8000, 9980)]