8781440

素因数分解:

$2^7\times 5^1\times {\mathrm{13721}}^1$

素因数の和:13740

約数の個数: 32

約数和(自身を含む): 20994660

約数和(自身を除く): 12213220

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 13721, 27442, 54884, 68605, 109768, 137210, 219536, 274420, 439072, 548840, 878144, 1097680, 1756288, 2195360, 4390720, 8781440]

約数ペア:

[(1, 8781440), (2, 4390720), (4, 2195360), (5, 1756288), (8, 1097680), (10, 878144), (16, 548840), (20, 439072), (32, 274420), (40, 219536), (64, 137210), (80, 109768), (128, 68605), (160, 54884), (320, 27442), (640, 13721)]