128256640

素因数分解:

$2^7\times 5^1\times {\mathrm{200401}}^1$

素因数の和:200420

約数の個数: 32

約数和(自身を含む): 306615060

約数和(自身を除く): 178358420

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 200401, 400802, 801604, 1002005, 1603208, 2004010, 3206416, 4008020, 6412832, 8016040, 12825664, 16032080, 25651328, 32064160, 64128320, 128256640]

約数ペア:

[(1, 128256640), (2, 64128320), (4, 32064160), (5, 25651328), (8, 16032080), (10, 12825664), (16, 8016040), (20, 6412832), (32, 4008020), (40, 3206416), (64, 2004010), (80, 1603208), (128, 1002005), (160, 801604), (320, 400802), (640, 200401)]