20212164 has 36 divisors (see below), whose sum is σ = 58391424. Its totient is φ = 5774832.

The previous prime is 20212151. The next prime is 20212183. The reversal of 20212164 is 46121202.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

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 11 ways as a sum of consecutive naturals, for example, 39852 + ... + 40355.

It is an arithmetic number, because the mean of its divisors is an integer number (1621984).

Almost surely, 2^20212164 is an apocalyptic number.

It is an amenable number.

20212164 is an abundant number, since it is smaller than the sum of its proper divisors (38179260).

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

20212164 is a wasteful number, since it uses less digits than its factorization.

20212164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80224 (or 80219 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20212164 is about 4495.7940344282. The cubic root of 20212164 is about 272.3982236424.

Adding to 20212164 its reverse (46121202), we get a palindrome (66333366).

The spelling of 20212164 in words is "twenty million, two hundred twelve thousand, one hundred sixty-four".