20516691792 has 20 divisors (see below), whose sum is σ = 53001453920. Its totient is φ = 6838897248.

The previous prime is 20516691751. The next prime is 20516691809. The reversal of 20516691792 is 29719661502.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 427431079 = 20516691792 / (2 + 0 + 5 + 1 + 6 + 6 + 9 + 1 + 7 + 9 + 2).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213715492 + ... + 213715587.

It is an arithmetic number, because the mean of its divisors is an integer number (2650072696).

Almost surely, 2^20516691792 is an apocalyptic number.

It is an amenable number.

20516691792 is an abundant number, since it is smaller than the sum of its proper divisors (32484762128).

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

20516691792 is a wasteful number, since it uses less digits than its factorization.

20516691792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427431090 (or 427431084 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 48.

The spelling of 20516691792 in words is "twenty billion, five hundred sixteen million, six hundred ninety-one thousand, seven hundred ninety-two".