20685448044 has 36 divisors (see below), whose sum is σ = 52304832216. Its totient is φ = 6892958208.

The previous prime is 20685448039. The next prime is 20685448057. The reversal of 20685448044 is 44084458602.

20685448044 is a `hidden beast` number, since 2 + 0 + 68 + 544 + 8 + 0 + 44 = 666.

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

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25612 + ... + 205004.

It is an arithmetic number, because the mean of its divisors is an integer number (1452912006).

Almost surely, 2^20685448044 is an apocalyptic number.

It is an amenable number.

20685448044 is an abundant number, since it is smaller than the sum of its proper divisors (31619384172).

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

20685448044 is a wasteful number, since it uses less digits than its factorization.

20685448044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182606 (or 182601 counting only the distinct ones).

The product of its (nonzero) digits is 983040, while the sum is 45.

The spelling of 20685448044 in words is "twenty billion, six hundred eighty-five million, four hundred forty-eight thousand, forty-four".