1000900000

素因数分解:

$2^5\times 5^5\times {\mathrm{10009}}^1$

素因数の和:10044

約数の個数: 72

約数和(自身を含む): 2463240780

約数和(自身を除く): 1462340780

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, 2000, 2500, 3125, 4000, 5000, 6250, 10000, 10009, 12500, 20000, 20018, 25000, 40036, 50000, 50045, 80072, 100000, 100090, 160144, 200180, 250225, 320288, 400360, 500450, 800720, 1000900, 1251125, 1601440, 2001800, 2502250, 4003600, 5004500, 6255625, 8007200, 10009000, 12511250, 20018000, 25022500, 31278125, 40036000, 50045000, 62556250, 100090000, 125112500, 200180000, 250225000, 500450000, 1000900000]

約数ペア:

[(1, 1000900000), (2, 500450000), (4, 250225000), (5, 200180000), (8, 125112500), (10, 100090000), (16, 62556250), (20, 50045000), (25, 40036000), (32, 31278125), (40, 25022500), (50, 20018000), (80, 12511250), (100, 10009000), (125, 8007200), (160, 6255625), (200, 5004500), (250, 4003600), (400, 2502250), (500, 2001800), (625, 1601440), (800, 1251125), (1000, 1000900), (1250, 800720), (2000, 500450), (2500, 400360), (3125, 320288), (4000, 250225), (5000, 200180), (6250, 160144), (10000, 100090), (10009, 100000), (12500, 80072), (20000, 50045), (20018, 50000), (25000, 40036)]