20505018116 has 12 divisors (see below), whose sum is σ = 39145943760. Its totient is φ = 9320462760.

The previous prime is 20505018103. The next prime is 20505018119. The reversal of 20505018116 is 61181050502.

It is not an unprimeable number, because it can be changed into a prime (20505018119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233011526 + ... + 233011613.

It is an arithmetic number, because the mean of its divisors is an integer number (3262161980).

Almost surely, 2^20505018116 is an apocalyptic number.

It is an amenable number.

20505018116 is a deficient number, since it is larger than the sum of its proper divisors (18640925644).

20505018116 is a wasteful number, since it uses less digits than its factorization.

20505018116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466023154 (or 466023152 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 29.

Adding to 20505018116 its reverse (61181050502), we get a palindrome (81686068618).

The spelling of 20505018116 in words is "twenty billion, five hundred five million, eighteen thousand, one hundred sixteen".