20481280

素因数分解:

$2^8\times 5^1\times {\mathrm{16001}}^1$

素因数の和:16022

約数の個数: 36

約数和(自身を含む): 49062132

約数和(自身を除く): 28580852

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 640, 1280, 16001, 32002, 64004, 80005, 128008, 160010, 256016, 320020, 512032, 640040, 1024064, 1280080, 2048128, 2560160, 4096256, 5120320, 10240640, 20481280]

約数ペア:

[(1, 20481280), (2, 10240640), (4, 5120320), (5, 4096256), (8, 2560160), (10, 2048128), (16, 1280080), (20, 1024064), (32, 640040), (40, 512032), (64, 320020), (80, 256016), (128, 160010), (160, 128008), (256, 80005), (320, 64004), (640, 32002), (1280, 16001)]