20503164 has 24 divisors (see below), whose sum is σ = 52190208. Its totient is φ = 6213040.

The previous prime is 20503159. The next prime is 20503177. The reversal of 20503164 is 46130502.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20503164.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77532 + ... + 77795.

It is an arithmetic number, because the mean of its divisors is an integer number (2174592).

Almost surely, 2^20503164 is an apocalyptic number.

It is an amenable number.

20503164 is an abundant number, since it is smaller than the sum of its proper divisors (31687044).

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

20503164 is a wasteful number, since it uses less digits than its factorization.

20503164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155345 (or 155343 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20503164 is about 4528.0419609363. The cubic root of 20503164 is about 273.6992633395.

Adding to 20503164 its reverse (46130502), we get a palindrome (66633666).

The spelling of 20503164 in words is "twenty million, five hundred three thousand, one hundred sixty-four".