20915000

素因数分解:

$2^3\times 5^4\times {\mathrm{47}}^1\times {\mathrm{89}}^1$

素因数の和:162

約数の個数: 80

約数和(自身を含む): 50608800

約数和(自身を除く): 29693800

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 47, 50, 89, 94, 100, 125, 178, 188, 200, 235, 250, 356, 376, 445, 470, 500, 625, 712, 890, 940, 1000, 1175, 1250, 1780, 1880, 2225, 2350, 2500, 3560, 4183, 4450, 4700, 5000, 5875, 8366, 8900, 9400, 11125, 11750, 16732, 17800, 20915, 22250, 23500, 29375, 33464, 41830, 44500, 47000, 55625, 58750, 83660, 89000, 104575, 111250, 117500, 167320, 209150, 222500, 235000, 418300, 445000, 522875, 836600, 1045750, 2091500, 2614375, 4183000, 5228750, 10457500, 20915000]

約数ペア:

[(1, 20915000), (2, 10457500), (4, 5228750), (5, 4183000), (8, 2614375), (10, 2091500), (20, 1045750), (25, 836600), (40, 522875), (47, 445000), (50, 418300), (89, 235000), (94, 222500), (100, 209150), (125, 167320), (178, 117500), (188, 111250), (200, 104575), (235, 89000), (250, 83660), (356, 58750), (376, 55625), (445, 47000), (470, 44500), (500, 41830), (625, 33464), (712, 29375), (890, 23500), (940, 22250), (1000, 20915), (1175, 17800), (1250, 16732), (1780, 11750), (1880, 11125), (2225, 9400), (2350, 8900), (2500, 8366), (3560, 5875), (4183, 5000), (4450, 4700)]