20040664 has 32 divisors (see below), whose sum is σ = 43437600. Its totient is φ = 8490240.

The previous prime is 20040619. The next prime is 20040667. The reversal of 20040664 is 46604002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20040667) 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, 2974 + ... + 6994.

It is an arithmetic number, because the mean of its divisors is an integer number (1357425).

Almost surely, 2^20040664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20040664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21718800).

20040664 is an abundant number, since it is smaller than the sum of its proper divisors (23396936).

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

20040664 is a wasteful number, since it uses less digits than its factorization.

20040664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4123 (or 4119 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20040664 is about 4476.6800198361. The cubic root of 20040664 is about 271.6256022508.

Adding to 20040664 its reverse (46604002), we get a palindrome (66644666).

The spelling of 20040664 in words is "twenty million, forty thousand, six hundred sixty-four".