20604564 has 24 divisors (see below), whose sum is σ = 53419520. Its totient is φ = 6868152.

The previous prime is 20604559. The next prime is 20604581. The reversal of 20604564 is 46540602.

It is a happy number.

20604564 is a `hidden beast` number, since 2 + 0 + 604 + 56 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 95284 + ... + 95499.

Almost surely, 2^20604564 is an apocalyptic number.

It is an amenable number.

20604564 is an abundant number, since it is smaller than the sum of its proper divisors (32814956).

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

20604564 is a wasteful number, since it uses less digits than its factorization.

20604564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190796 (or 190788 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 20604564 is about 4539.2250439915. The cubic root of 20604564 is about 274.1497219269.

The spelling of 20604564 in words is "twenty million, six hundred four thousand, five hundred sixty-four".