20211164 has 24 divisors (see below), whose sum is σ = 37911888. Its totient is φ = 9393920.

The previous prime is 20211157. The next prime is 20211167. The reversal of 20211164 is 46111202.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211167) by changing a digit.

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, 3854 + ... + 7434.

It is an arithmetic number, because the mean of its divisors is an integer number (1579662).

Almost surely, 2^20211164 is an apocalyptic number.

It is an amenable number.

20211164 is a deficient number, since it is larger than the sum of its proper divisors (17700724).

20211164 is a wasteful number, since it uses less digits than its factorization.

20211164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3685 (or 3683 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 20211164 is about 4495.6828179933. The cubic root of 20211164 is about 272.3937312533.

Adding to 20211164 its reverse (46111202), we get a palindrome (66322366).

The spelling of 20211164 in words is "twenty million, two hundred eleven thousand, one hundred sixty-four".