20160813 has 4 divisors (see below), whose sum is σ = 26881088. Its totient is φ = 13440540.

The previous prime is 20160809. The next prime is 20160817. The reversal of 20160813 is 31806102.

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 an interprime number because it is at equal distance from previous prime (20160809) and next prime (20160817).

It is not a de Polignac number, because 20160813 - 2² = 20160809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20160813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20160817) 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, 3360133 + ... + 3360138.

It is an arithmetic number, because the mean of its divisors is an integer number (6720272).

Almost surely, 2^20160813 is an apocalyptic number.

It is an amenable number.

20160813 is a deficient number, since it is larger than the sum of its proper divisors (6720275).

20160813 is an equidigital number, since it uses as much as digits as its factorization.

20160813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6720274.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 20160813 is about 4490.0793979617. The cubic root of 20160813 is about 272.1673431385.

Adding to 20160813 its reverse (31806102), we get a palindrome (51966915).

The spelling of 20160813 in words is "twenty million, one hundred sixty thousand, eight hundred thirteen".