21315640

素因数分解:

$2^3\times 5^1\times {\mathrm{727}}^1\times {\mathrm{733}}^1$

素因数の和:1471

約数の個数: 32

約数和(自身を含む): 48091680

約数和(自身を除く): 26776040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 727, 733, 1454, 1466, 2908, 2932, 3635, 3665, 5816, 5864, 7270, 7330, 14540, 14660, 29080, 29320, 532891, 1065782, 2131564, 2664455, 4263128, 5328910, 10657820, 21315640]

約数ペア:

[(1, 21315640), (2, 10657820), (4, 5328910), (5, 4263128), (8, 2664455), (10, 2131564), (20, 1065782), (40, 532891), (727, 29320), (733, 29080), (1454, 14660), (1466, 14540), (2908, 7330), (2932, 7270), (3635, 5864), (3665, 5816)]