21805000

素因数分解:

$2^3\times 5^4\times 7^2\times {\mathrm{89}}^1$

素因数の和:129

約数の個数: 120

約数和(自身を含む): 60097950

約数和(自身を除く): 38292950

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 25, 28, 35, 40, 49, 50, 56, 70, 89, 98, 100, 125, 140, 175, 178, 196, 200, 245, 250, 280, 350, 356, 392, 445, 490, 500, 623, 625, 700, 712, 875, 890, 980, 1000, 1225, 1246, 1250, 1400, 1750, 1780, 1960, 2225, 2450, 2492, 2500, 3115, 3500, 3560, 4361, 4375, 4450, 4900, 4984, 5000, 6125, 6230, 7000, 8722, 8750, 8900, 9800, 11125, 12250, 12460, 15575, 17444, 17500, 17800, 21805, 22250, 24500, 24920, 30625, 31150, 34888, 35000, 43610, 44500, 49000, 55625, 61250, 62300, 77875, 87220, 89000, 109025, 111250, 122500, 124600, 155750, 174440, 218050, 222500, 245000, 311500, 389375, 436100, 445000, 545125, 623000, 778750, 872200, 1090250, 1557500, 2180500, 2725625, 3115000, 4361000, 5451250, 10902500, 21805000]

約数ペア:

[(1, 21805000), (2, 10902500), (4, 5451250), (5, 4361000), (7, 3115000), (8, 2725625), (10, 2180500), (14, 1557500), (20, 1090250), (25, 872200), (28, 778750), (35, 623000), (40, 545125), (49, 445000), (50, 436100), (56, 389375), (70, 311500), (89, 245000), (98, 222500), (100, 218050), (125, 174440), (140, 155750), (175, 124600), (178, 122500), (196, 111250), (200, 109025), (245, 89000), (250, 87220), (280, 77875), (350, 62300), (356, 61250), (392, 55625), (445, 49000), (490, 44500), (500, 43610), (623, 35000), (625, 34888), (700, 31150), (712, 30625), (875, 24920), (890, 24500), (980, 22250), (1000, 21805), (1225, 17800), (1246, 17500), (1250, 17444), (1400, 15575), (1750, 12460), (1780, 12250), (1960, 11125), (2225, 9800), (2450, 8900), (2492, 8750), (2500, 8722), (3115, 7000), (3500, 6230), (3560, 6125), (4361, 5000), (4375, 4984), (4450, 4900)]