20656640

素因数分解:

$2^9\times 5^1\times {\mathrm{8069}}^1$

素因数の和:8092

約数の個数: 40

約数和(自身を含む): 49533660

約数和(自身を除く): 28877020

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1280, 2560, 8069, 16138, 32276, 40345, 64552, 80690, 129104, 161380, 258208, 322760, 516416, 645520, 1032832, 1291040, 2065664, 2582080, 4131328, 5164160, 10328320, 20656640]

約数ペア:

[(1, 20656640), (2, 10328320), (4, 5164160), (5, 4131328), (8, 2582080), (10, 2065664), (16, 1291040), (20, 1032832), (32, 645520), (40, 516416), (64, 322760), (80, 258208), (128, 161380), (160, 129104), (256, 80690), (320, 64552), (512, 40345), (640, 32276), (1280, 16138), (2560, 8069)]