2018990000

素因数分解:

$2^4\times 5^4\times {\mathrm{101}}^1\times {\mathrm{1999}}^1$

素因数の和:2128

約数の個数: 100

約数和(自身を含む): 4939044000

約数和(自身を除く): 2920054000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 101, 125, 200, 202, 250, 400, 404, 500, 505, 625, 808, 1000, 1010, 1250, 1616, 1999, 2000, 2020, 2500, 2525, 3998, 4040, 5000, 5050, 7996, 8080, 9995, 10000, 10100, 12625, 15992, 19990, 20200, 25250, 31984, 39980, 40400, 49975, 50500, 63125, 79960, 99950, 101000, 126250, 159920, 199900, 201899, 202000, 249875, 252500, 399800, 403798, 499750, 505000, 799600, 807596, 999500, 1009495, 1010000, 1249375, 1615192, 1999000, 2018990, 2498750, 3230384, 3998000, 4037980, 4997500, 5047475, 8075960, 9995000, 10094950, 16151920, 19990000, 20189900, 25237375, 40379800, 50474750, 80759600, 100949500, 126186875, 201899000, 252373750, 403798000, 504747500, 1009495000, 2018990000]

約数ペア:

[(1, 2018990000), (2, 1009495000), (4, 504747500), (5, 403798000), (8, 252373750), (10, 201899000), (16, 126186875), (20, 100949500), (25, 80759600), (40, 50474750), (50, 40379800), (80, 25237375), (100, 20189900), (101, 19990000), (125, 16151920), (200, 10094950), (202, 9995000), (250, 8075960), (400, 5047475), (404, 4997500), (500, 4037980), (505, 3998000), (625, 3230384), (808, 2498750), (1000, 2018990), (1010, 1999000), (1250, 1615192), (1616, 1249375), (1999, 1010000), (2000, 1009495), (2020, 999500), (2500, 807596), (2525, 799600), (3998, 505000), (4040, 499750), (5000, 403798), (5050, 399800), (7996, 252500), (8080, 249875), (9995, 202000), (10000, 201899), (10100, 199900), (12625, 159920), (15992, 126250), (19990, 101000), (20200, 99950), (25250, 79960), (31984, 63125), (39980, 50500), (40400, 49975)]