2560000

素因数分解:

$2^{12}\times 5^4$

素因数の和:44

約数の個数: 65

約数和(自身を含む): 6397171

約数和(自身を除く): 3837171

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 128, 160, 200, 250, 256, 320, 400, 500, 512, 625, 640, 800, 1000, 1024, 1250, 1280, 1600, 2000, 2048, 2500, 2560, 3200, 4000, 4096, 5000, 5120, 6400, 8000, 10000, 10240, 12800, 16000, 20000, 20480, 25600, 32000, 40000, 51200, 64000, 80000, 102400, 128000, 160000, 256000, 320000, 512000, 640000, 1280000, 2560000]

約数ペア:

[(1, 2560000), (2, 1280000), (4, 640000), (5, 512000), (8, 320000), (10, 256000), (16, 160000), (20, 128000), (25, 102400), (32, 80000), (40, 64000), (50, 51200), (64, 40000), (80, 32000), (100, 25600), (125, 20480), (128, 20000), (160, 16000), (200, 12800), (250, 10240), (256, 10000), (320, 8000), (400, 6400), (500, 5120), (512, 5000), (625, 4096), (640, 4000), (800, 3200), (1000, 2560), (1024, 2500), (1250, 2048), (1280, 2000)]