20855011392 has 168 divisors, whose sum is σ = 63388850616. Its totient is φ = 6532890624.

The previous prime is 20855011391. The next prime is 20855011433. The reversal of 20855011392 is 29311055802.

20855011392 is a `hidden beast` number, since 2 + 0 + 8 + 550 + 1 + 13 + 92 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4577334336 + 16277677056 = 67656^2 + 127584^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20855011391) 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, 9173968 + ... + 9176240.

It is an arithmetic number, because the mean of its divisors is an integer number (377314587).

Almost surely, 2^20855011392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20855011392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31694425308).

20855011392 is an abundant number, since it is smaller than the sum of its proper divisors (42533839224).

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

20855011392 is a wasteful number, since it uses less digits than its factorization.

20855011392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3245 (or 3232 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 20855011392 in words is "twenty billion, eight hundred fifty-five million, eleven thousand, three hundred ninety-two".