20604523644 has 36 divisors (see below), whose sum is σ = 52301602080. Its totient is φ = 6839434560.

The previous prime is 20604523631. The next prime is 20604523661. The reversal of 20604523644 is 44632540602.

20604523644 is a `hidden beast` number, since 2 + 0 + 6 + 0 + 4 + 5 + 2 + 3 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 20604523599 and 20604523608.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1188777 + ... + 1205984.

It is an arithmetic number, because the mean of its divisors is an integer number (1452822280).

Almost surely, 2^20604523644 is an apocalyptic number.

It is an amenable number.

20604523644 is an abundant number, since it is smaller than the sum of its proper divisors (31697078436).

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

20604523644 is a wasteful number, since it uses less digits than its factorization.

20604523644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2395010 (or 2395005 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

The spelling of 20604523644 in words is "twenty billion, six hundred four million, five hundred twenty-three thousand, six hundred forty-four".