20399031167 has 4 divisors (see below), whose sum is σ = 20733441576. Its totient is φ = 20064620760.

The previous prime is 20399031089. The next prime is 20399031181. The reversal of 20399031167 is 76113099302.

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

It is a cyclic number.

It is not a de Polignac number, because 20399031167 - 2²⁴ = 20382253951 is a prime.

It is a super-2 number, since 2×20399031167² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20399031067) 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, 167205113 + ... + 167205234.

It is an arithmetic number, because the mean of its divisors is an integer number (5183360394).

Almost surely, 2^20399031167 is an apocalyptic number.

20399031167 is a deficient number, since it is larger than the sum of its proper divisors (334410409).

20399031167 is an equidigital number, since it uses as much as digits as its factorization.

20399031167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334410408.

The product of its (nonzero) digits is 61236, while the sum is 41.

The spelling of 20399031167 in words is "twenty billion, three hundred ninety-nine million, thirty-one thousand, one hundred sixty-seven".