79960000

素因数分解:

$2^6\times 5^4\times {\mathrm{1999}}^1$

素因数の和:2031

約数の個数: 70

約数和(自身を含む): 198374000

約数和(自身を除く): 118414000

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, 625, 800, 1000, 1250, 1600, 1999, 2000, 2500, 3998, 4000, 5000, 7996, 8000, 9995, 10000, 15992, 19990, 20000, 31984, 39980, 40000, 49975, 63968, 79960, 99950, 127936, 159920, 199900, 249875, 319840, 399800, 499750, 639680, 799600, 999500, 1249375, 1599200, 1999000, 2498750, 3198400, 3998000, 4997500, 7996000, 9995000, 15992000, 19990000, 39980000, 79960000]

約数ペア:

[(1, 79960000), (2, 39980000), (4, 19990000), (5, 15992000), (8, 9995000), (10, 7996000), (16, 4997500), (20, 3998000), (25, 3198400), (32, 2498750), (40, 1999000), (50, 1599200), (64, 1249375), (80, 999500), (100, 799600), (125, 639680), (160, 499750), (200, 399800), (250, 319840), (320, 249875), (400, 199900), (500, 159920), (625, 127936), (800, 99950), (1000, 79960), (1250, 63968), (1600, 49975), (1999, 40000), (2000, 39980), (2500, 31984), (3998, 20000), (4000, 19990), (5000, 15992), (7996, 10000), (8000, 9995)]