20503512634 has 16 divisors (see below), whose sum is σ = 34369526016. Its totient is φ = 9092466400.

The previous prime is 20503512629. The next prime is 20503512641. The reversal of 20503512634 is 43621530502.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20503512596 and 20503512605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11364682 + ... + 11366485.

It is an arithmetic number, because the mean of its divisors is an integer number (2148095376).

Almost surely, 2^20503512634 is an apocalyptic number.

20503512634 is a deficient number, since it is larger than the sum of its proper divisors (13866013382).

20503512634 is a wasteful number, since it uses less digits than its factorization.

20503512634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22731221.

The product of its (nonzero) digits is 21600, while the sum is 31.

The spelling of 20503512634 in words is "twenty billion, five hundred three million, five hundred twelve thousand, six hundred thirty-four".