20604664 has 32 divisors (see below), whose sum is σ = 40896000. Its totient is φ = 9705312.

The previous prime is 20604613. The next prime is 20604679. The reversal of 20604664 is 46640602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42777 + ... + 43255.

It is an arithmetic number, because the mean of its divisors is an integer number (1278000).

Almost surely, 2^20604664 is an apocalyptic number.

It is an amenable number.

20604664 is a deficient number, since it is larger than the sum of its proper divisors (20291336).

20604664 is a wasteful number, since it uses less digits than its factorization.

20604664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787 (or 783 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 20604664 is about 4539.2360590743. The cubic root of 20604664 is about 274.1501654359.

It can be divided in two parts, 2060 and 4664, that added together give a square (6724 = 82²).

The spelling of 20604664 in words is "twenty million, six hundred four thousand, six hundred sixty-four".