409248640

素因数分解:

$2^7\times 5^1\times {\mathrm{639451}}^1$

素因数の和:639470

約数の個数: 32

約数和(自身を含む): 978361560

約数和(自身を除く): 569112920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 639451, 1278902, 2557804, 3197255, 5115608, 6394510, 10231216, 12789020, 20462432, 25578040, 40924864, 51156080, 81849728, 102312160, 204624320, 409248640]

約数ペア:

[(1, 409248640), (2, 204624320), (4, 102312160), (5, 81849728), (8, 51156080), (10, 40924864), (16, 25578040), (20, 20462432), (32, 12789020), (40, 10231216), (64, 6394510), (80, 5115608), (128, 3197255), (160, 2557804), (320, 1278902), (640, 639451)]