20513161233 has 24 divisors (see below), whose sum is σ = 30572575488. Its totient is φ = 13246463232.

The previous prime is 20513161219. The next prime is 20513161237. The reversal of 20513161233 is 33216131502.

20513161233 is a `hidden beast` number, since 2 + 0 + 5 + 13 + 1 + 612 + 33 = 666.

It is not a de Polignac number, because 20513161233 - 2⁴ = 20513161217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20513161197 and 20513161206.

It is not an unprimeable number, because it can be changed into a prime (20513161237) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 208941 + ... + 291002.

It is an arithmetic number, because the mean of its divisors is an integer number (1273857312).

Almost surely, 2^20513161233 is an apocalyptic number.

It is an amenable number.

20513161233 is a deficient number, since it is larger than the sum of its proper divisors (10059414255).

20513161233 is a wasteful number, since it uses less digits than its factorization.

20513161233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500093 (or 500090 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

Adding to 20513161233 its reverse (33216131502), we get a palindrome (53729292735).

The spelling of 20513161233 in words is "twenty billion, five hundred thirteen million, one hundred sixty-one thousand, two hundred thirty-three".