20839661604 has 72 divisors (see below), whose sum is σ = 53514901440. Its totient is φ = 6837048000.

The previous prime is 20839661603. The next prime is 20839661621. The reversal of 20839661604 is 40616693802.

20839661604 is a `hidden beast` number, since 2 + 0 + 8 + 39 + 6 + 6 + 1 + 604 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20839661604.

It is not an unprimeable number, because it can be changed into a prime (20839661603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 574939 + ... + 610109.

It is an arithmetic number, because the mean of its divisors is an integer number (743262520).

Almost surely, 2^20839661604 is an apocalyptic number.

It is an amenable number.

20839661604 is an abundant number, since it is smaller than the sum of its proper divisors (32675239836).

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

20839661604 is a wasteful number, since it uses less digits than its factorization.

20839661604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35441 (or 35436 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 20839661604 in words is "twenty billion, eight hundred thirty-nine million, six hundred sixty-one thousand, six hundred four".