20000813 has 4 divisors (see below), whose sum is σ = 22858080. Its totient is φ = 17143548.

The previous prime is 20000801. The next prime is 20000821. The reversal of 20000813 is 31800002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20000813 - 2¹⁰ = 19999789 is a prime.

20000813 is a modest number, since divided by 813 gives 200 as remainder.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000843) 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, 1428623 + ... + 1428636.

It is an arithmetic number, because the mean of its divisors is an integer number (5714520).

Almost surely, 2^20000813 is an apocalyptic number.

It is an amenable number.

20000813 is a deficient number, since it is larger than the sum of its proper divisors (2857267).

20000813 is an equidigital number, since it uses as much as digits as its factorization.

20000813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857266.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 20000813 is about 4472.2268502392. The cubic root of 20000813 is about 271.4454396455.

Adding to 20000813 its reverse (31800002), we get a palindrome (51800815).

The spelling of 20000813 in words is "twenty million, eight hundred thirteen", and thus it is an aban number.