21390728

素因数分解:

$2^3\times {\mathrm{131}}^1\times {\mathrm{20411}}^1$

素因数の和:20548

約数の個数: 16

約数和(自身を含む): 40415760

約数和(自身を除く): 19025032

約数列:

[1, 2, 4, 8, 131, 262, 524, 1048, 20411, 40822, 81644, 163288, 2673841, 5347682, 10695364, 21390728]

約数ペア:

[(1, 21390728), (2, 10695364), (4, 5347682), (8, 2673841), (131, 163288), (262, 81644), (524, 40822), (1048, 20411)]