20609304672 has 72 divisors (see below), whose sum is σ = 59464690488. Its totient is φ = 6245240320.

The previous prime is 20609304671. The next prime is 20609304707. The reversal of 20609304672 is 27640390602.

It is a self number, because there is not a number n which added to its sum of digits gives 20609304672.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20609304671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 875493 + ... + 898724.

It is an arithmetic number, because the mean of its divisors is an integer number (825898479).

Almost surely, 2^20609304672 is an apocalyptic number.

20609304672 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20609304672 is an abundant number, since it is smaller than the sum of its proper divisors (38855385816).

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

20609304672 is a wasteful number, since it uses less digits than its factorization.

20609304672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1774252 (or 1774233 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 39.

It can be divided in two parts, 2060930 and 4672, that added together give a palindrome (2065602).

The spelling of 20609304672 in words is "twenty billion, six hundred nine million, three hundred four thousand, six hundred seventy-two".