20212664 has 8 divisors (see below), whose sum is σ = 37898760. Its totient is φ = 10106328.

The previous prime is 20212639. The next prime is 20212667. The reversal of 20212664 is 46621202.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212667) 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 as a sum of consecutive naturals, namely, 1263284 + ... + 1263299.

It is an arithmetic number, because the mean of its divisors is an integer number (4737345).

Almost surely, 2^20212664 is an apocalyptic number.

It is an amenable number.

20212664 is a deficient number, since it is larger than the sum of its proper divisors (17686096).

20212664 is a wasteful number, since it uses less digits than its factorization.

20212664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526589 (or 2526585 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20212664 is about 4495.8496416139. The cubic root of 20212664 is about 272.4004697814.

Adding to 20212664 its reverse (46621202), we get a palindrome (66833866).

The spelling of 20212664 in words is "twenty million, two hundred twelve thousand, six hundred sixty-four".