21391280

素因数分解:

$2^4\times 5^1\times {\mathrm{267391}}^1$

素因数の和:267404

約数の個数: 20

約数和(自身を含む): 49734912

約数和(自身を除く): 28343632

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 267391, 534782, 1069564, 1336955, 2139128, 2673910, 4278256, 5347820, 10695640, 21391280]

約数ペア:

[(1, 21391280), (2, 10695640), (4, 5347820), (5, 4278256), (8, 2673910), (10, 2139128), (16, 1336955), (20, 1069564), (40, 534782), (80, 267391)]