321280

素因数分解:

$2^8\times 5^1\times {\mathrm{251}}^1$

素因数の和:272

約数の個数: 36

約数和(自身を含む): 772632

約数和(自身を除く): 451352

約数列:

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

約数ペア:

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