20002664 has 16 divisors (see below), whose sum is σ = 40914720. Its totient is φ = 9092080.

The previous prime is 20002651. The next prime is 20002667. The reversal of 20002664 is 46620002.

It is not an unprimeable number, because it can be changed into a prime (20002667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113564 + ... + 113739.

It is an arithmetic number, because the mean of its divisors is an integer number (2557170).

Almost surely, 2^20002664 is an apocalyptic number.

It is an amenable number.

20002664 is an abundant number, since it is smaller than the sum of its proper divisors (20912056).

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

20002664 is a wasteful number, since it uses less digits than its factorization.

20002664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227320 (or 227316 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20002664 is about 4472.4337893366. The cubic root of 20002664 is about 271.4538131386.

Adding to 20002664 its reverse (46620002), we get a palindrome (66622666).

It can be divided in two parts, 2000 and 2664, that added together give a palindrome (4664).

The spelling of 20002664 in words is "twenty million, two thousand, six hundred sixty-four".