20812164 has 24 divisors (see below), whose sum is σ = 49596288. Its totient is φ = 6789600.

The previous prime is 20812157. The next prime is 20812177. The reversal of 20812164 is 46121802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17887 + ... + 19014.

It is an arithmetic number, because the mean of its divisors is an integer number (2066512).

Almost surely, 2^20812164 is an apocalyptic number.

It is an amenable number.

20812164 is an abundant number, since it is smaller than the sum of its proper divisors (28784124).

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

20812164 is a wasteful number, since it uses less digits than its factorization.

20812164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36955 (or 36953 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 20812164 is about 4562.0350722019. The cubic root of 20812164 is about 275.0673730244.

Adding to 20812164 its reverse (46121802), we get a palindrome (66933966).

The spelling of 20812164 in words is "twenty million, eight hundred twelve thousand, one hundred sixty-four".