642560

素因数分解:

$2^9\times 5^1\times {\mathrm{251}}^1$

素因数の和:274

約数の個数: 40

約数和(自身を含む): 1546776

約数和(自身を除く): 904216

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 251, 256, 320, 502, 512, 640, 1004, 1255, 1280, 2008, 2510, 2560, 4016, 5020, 8032, 10040, 16064, 20080, 32128, 40160, 64256, 80320, 128512, 160640, 321280, 642560]

約数ペア:

[(1, 642560), (2, 321280), (4, 160640), (5, 128512), (8, 80320), (10, 64256), (16, 40160), (20, 32128), (32, 20080), (40, 16064), (64, 10040), (80, 8032), (128, 5020), (160, 4016), (251, 2560), (256, 2510), (320, 2008), (502, 1280), (512, 1255), (640, 1004)]