20664260604 has 72 divisors (see below), whose sum is σ = 57045092832. Its totient is φ = 6268671360.

The previous prime is 20664260569. The next prime is 20664260611. The reversal of 20664260604 is 40606246602.

20664260604 is a `hidden beast` number, since 2 + 0 + 6 + 6 + 42 + 6 + 0 + 604 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 277719 + ... + 344174.

It is an arithmetic number, because the mean of its divisors is an integer number (792292956).

Almost surely, 2^20664260604 is an apocalyptic number.

It is an amenable number.

20664260604 is an abundant number, since it is smaller than the sum of its proper divisors (36380832228).

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

20664260604 is a wasteful number, since it uses less digits than its factorization.

20664260604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621987 (or 621982 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The spelling of 20664260604 in words is "twenty billion, six hundred sixty-four million, two hundred sixty thousand, six hundred four".