20710400

素因数分解:

$2^{10}\times 5^2\times {\mathrm{809}}^1$

素因数の和:839

約数の個数: 66

約数和(自身を含む): 51400170

約数和(自身を除く): 30689770

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 128, 160, 200, 256, 320, 400, 512, 640, 800, 809, 1024, 1280, 1600, 1618, 2560, 3200, 3236, 4045, 5120, 6400, 6472, 8090, 12800, 12944, 16180, 20225, 25600, 25888, 32360, 40450, 51776, 64720, 80900, 103552, 129440, 161800, 207104, 258880, 323600, 414208, 517760, 647200, 828416, 1035520, 1294400, 2071040, 2588800, 4142080, 5177600, 10355200, 20710400]

約数ペア:

[(1, 20710400), (2, 10355200), (4, 5177600), (5, 4142080), (8, 2588800), (10, 2071040), (16, 1294400), (20, 1035520), (25, 828416), (32, 647200), (40, 517760), (50, 414208), (64, 323600), (80, 258880), (100, 207104), (128, 161800), (160, 129440), (200, 103552), (256, 80900), (320, 64720), (400, 51776), (512, 40450), (640, 32360), (800, 25888), (809, 25600), (1024, 20225), (1280, 16180), (1600, 12944), (1618, 12800), (2560, 8090), (3200, 6472), (3236, 6400), (4045, 5120)]