Numbers k whose abundance is 20: sigma(k) - 2*k = 20.

Terms

a(0) =176a(1) =1376a(2) =3230a(3) =3770a(4) =6848a(5) =114256a(6) =125696a(7) =544310a(8) =561824a(9) =740870a(10) =2075648a(11) =4199030a(12) =4607296a(13) =8436950a(14) =33468416a(15) =134045696a(16) =199272950a(17) =624032630a(18) =1113445430a(19) =1550860550a(20) =85905593344