199900000

素因数分解:

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

素因数の和:2034

約数の個数: 72

約数和(自身を含む): 492156000

約数和(自身を除く): 292256000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 125, 160, 200, 250, 400, 500, 625, 800, 1000, 1250, 1999, 2000, 2500, 3125, 3998, 4000, 5000, 6250, 7996, 9995, 10000, 12500, 15992, 19990, 20000, 25000, 31984, 39980, 49975, 50000, 63968, 79960, 99950, 100000, 159920, 199900, 249875, 319840, 399800, 499750, 799600, 999500, 1249375, 1599200, 1999000, 2498750, 3998000, 4997500, 6246875, 7996000, 9995000, 12493750, 19990000, 24987500, 39980000, 49975000, 99950000, 199900000]

約数ペア:

[(1, 199900000), (2, 99950000), (4, 49975000), (5, 39980000), (8, 24987500), (10, 19990000), (16, 12493750), (20, 9995000), (25, 7996000), (32, 6246875), (40, 4997500), (50, 3998000), (80, 2498750), (100, 1999000), (125, 1599200), (160, 1249375), (200, 999500), (250, 799600), (400, 499750), (500, 399800), (625, 319840), (800, 249875), (1000, 199900), (1250, 159920), (1999, 100000), (2000, 99950), (2500, 79960), (3125, 63968), (3998, 50000), (4000, 49975), (5000, 39980), (6250, 31984), (7996, 25000), (9995, 20000), (10000, 19990), (12500, 15992)]