20685448042 has 16 divisors (see below), whose sum is σ = 35478293760. Its totient is φ = 8860810608.

The previous prime is 20685448039. The next prime is 20685448057. The reversal of 20685448042 is 24084458602.

It is a self number, because there is not a number n which added to its sum of digits gives 20685448042.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335698 + ... + 392509.

It is an arithmetic number, because the mean of its divisors is an integer number (2217393360).

Almost surely, 2^20685448042 is an apocalyptic number.

20685448042 is a deficient number, since it is larger than the sum of its proper divisors (14792845718).

20685448042 is a wasteful number, since it uses less digits than its factorization.

20685448042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730245.

The product of its (nonzero) digits is 491520, while the sum is 43.

The spelling of 20685448042 in words is "twenty billion, six hundred eighty-five million, four hundred forty-eight thousand, forty-two".