21040000

素因数分解:

$2^7\times 5^4\times {\mathrm{263}}^1$

素因数の和:297

約数の個数: 80

約数和(自身を含む): 52576920

約数和(自身を除く): 31536920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 128, 160, 200, 250, 263, 320, 400, 500, 526, 625, 640, 800, 1000, 1052, 1250, 1315, 1600, 2000, 2104, 2500, 2630, 3200, 4000, 4208, 5000, 5260, 6575, 8000, 8416, 10000, 10520, 13150, 16000, 16832, 20000, 21040, 26300, 32875, 33664, 40000, 42080, 52600, 65750, 80000, 84160, 105200, 131500, 164375, 168320, 210400, 263000, 328750, 420800, 526000, 657500, 841600, 1052000, 1315000, 2104000, 2630000, 4208000, 5260000, 10520000, 21040000]

約数ペア:

[(1, 21040000), (2, 10520000), (4, 5260000), (5, 4208000), (8, 2630000), (10, 2104000), (16, 1315000), (20, 1052000), (25, 841600), (32, 657500), (40, 526000), (50, 420800), (64, 328750), (80, 263000), (100, 210400), (125, 168320), (128, 164375), (160, 131500), (200, 105200), (250, 84160), (263, 80000), (320, 65750), (400, 52600), (500, 42080), (526, 40000), (625, 33664), (640, 32875), (800, 26300), (1000, 21040), (1052, 20000), (1250, 16832), (1315, 16000), (1600, 13150), (2000, 10520), (2104, 10000), (2500, 8416), (2630, 8000), (3200, 6575), (4000, 5260), (4208, 5000)]