20163623813 has 4 divisors (see below), whose sum is σ = 20164322508. Its totient is φ = 20162925120.

The previous prime is 20163623807. The next prime is 20163623861. The reversal of 20163623813 is 31832636102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9274075204 + 10889548609 = 96302^2 + 104353^2 .

It is a cyclic number.

It is not a de Polignac number, because 20163623813 - 2²² = 20159429509 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 (20163623113) 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, 304106 + ... + 364427.

It is an arithmetic number, because the mean of its divisors is an integer number (5041080627).

Almost surely, 2^20163623813 is an apocalyptic number.

It is an amenable number.

20163623813 is a deficient number, since it is larger than the sum of its proper divisors (698695).

20163623813 is an equidigital number, since it uses as much as digits as its factorization.

20163623813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698694.

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 20163623813 in words is "twenty billion, one hundred sixty-three million, six hundred twenty-three thousand, eight hundred thirteen".