20112813 has 16 divisors (see below), whose sum is σ = 34053760. Its totient is φ = 11492928.

The previous prime is 20112791. The next prime is 20112817. The reversal of 20112813 is 31821102.

It is not a de Polignac number, because 20112813 - 2¹⁰ = 20111789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53020 + ... + 53397.

It is an arithmetic number, because the mean of its divisors is an integer number (2128360).

Almost surely, 2^20112813 is an apocalyptic number.

It is an amenable number.

20112813 is a deficient number, since it is larger than the sum of its proper divisors (13940947).

20112813 is a wasteful number, since it uses less digits than its factorization.

20112813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106433 (or 106427 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 20112813 is about 4484.7310956177. The cubic root of 20112813 is about 271.9511743747.

Adding to 20112813 its reverse (31821102), we get a palindrome (51933915).

The spelling of 20112813 in words is "twenty million, one hundred twelve thousand, eight hundred thirteen".