256640

素因数分解:

$2^7\times 5^1\times {\mathrm{401}}^1$

素因数の和:420

約数の個数: 32

約数和(自身を含む): 615060

約数和(自身を除く): 358420

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 401, 640, 802, 1604, 2005, 3208, 4010, 6416, 8020, 12832, 16040, 25664, 32080, 51328, 64160, 128320, 256640]

約数ペア:

[(1, 256640), (2, 128320), (4, 64160), (5, 51328), (8, 32080), (10, 25664), (16, 16040), (20, 12832), (32, 8020), (40, 6416), (64, 4010), (80, 3208), (128, 2005), (160, 1604), (320, 802), (401, 640)]