20008664 has 16 divisors (see below), whose sum is σ = 40402320. Its totient is φ = 9234720.

The previous prime is 20008663. The next prime is 20008669. The reversal of 20008664 is 46680002.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20008663) 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, 96092 + ... + 96299.

It is an arithmetic number, because the mean of its divisors is an integer number (2525145).

Almost surely, 2^20008664 is an apocalyptic number.

It is an amenable number.

20008664 is an abundant number, since it is smaller than the sum of its proper divisors (20393656).

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

20008664 is a wasteful number, since it uses less digits than its factorization.

20008664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192410 (or 192406 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20008664 is about 4473.1045147638. The cubic root of 20008664 is about 271.4809521913.

Adding to 20008664 its reverse (46680002), we get a palindrome (66688666).

The spelling of 20008664 in words is "twenty million, eight thousand, six hundred sixty-four".