1280000

素因数分解:

$2^{11}\times 5^4$

素因数の和:42

約数の個数: 60

約数和(自身を含む): 3198195

約数和(自身を除く): 1918195

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, 5000, 5120, 6400, 8000, 10000, 10240, 12800, 16000, 20000, 25600, 32000, 40000, 51200, 64000, 80000, 128000, 160000, 256000, 320000, 640000, 1280000]

約数ペア:

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