18001000

素因数分解:

$2^3\times 5^3\times {\mathrm{47}}^1\times {\mathrm{383}}^1$

素因数の和:451

約数の個数: 64

約数和(自身を含む): 43130880

約数和(自身を除く): 25129880

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 47, 50, 94, 100, 125, 188, 200, 235, 250, 376, 383, 470, 500, 766, 940, 1000, 1175, 1532, 1880, 1915, 2350, 3064, 3830, 4700, 5875, 7660, 9400, 9575, 11750, 15320, 18001, 19150, 23500, 36002, 38300, 47000, 47875, 72004, 76600, 90005, 95750, 144008, 180010, 191500, 360020, 383000, 450025, 720040, 900050, 1800100, 2250125, 3600200, 4500250, 9000500, 18001000]

約数ペア:

[(1, 18001000), (2, 9000500), (4, 4500250), (5, 3600200), (8, 2250125), (10, 1800100), (20, 900050), (25, 720040), (40, 450025), (47, 383000), (50, 360020), (94, 191500), (100, 180010), (125, 144008), (188, 95750), (200, 90005), (235, 76600), (250, 72004), (376, 47875), (383, 47000), (470, 38300), (500, 36002), (766, 23500), (940, 19150), (1000, 18001), (1175, 15320), (1532, 11750), (1880, 9575), (1915, 9400), (2350, 7660), (3064, 5875), (3830, 4700)]