20431164 has 24 divisors (see below), whose sum is σ = 51340240. Its totient is φ = 6286464.

The previous prime is 20431123. The next prime is 20431171. The reversal of 20431164 is 46113402.

It is a self number, because there is not a number n which added to its sum of digits gives 20431164.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65329 + ... + 65640.

Almost surely, 2^20431164 is an apocalyptic number.

It is an amenable number.

20431164 is an abundant number, since it is smaller than the sum of its proper divisors (30909076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20431164 is a wasteful number, since it uses less digits than its factorization.

20431164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130989 (or 130987 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20431164 is about 4520.0845124843. The cubic root of 20431164 is about 273.3785086281.

Adding to 20431164 its reverse (46113402), we get a palindrome (66544566).

The spelling of 20431164 in words is "twenty million, four hundred thirty-one thousand, one hundred sixty-four".