20552821056 has 168 divisors, whose sum is σ = 62617014720. Its totient is φ = 6426998784.

The previous prime is 20552821049. The next prime is 20552821067. The reversal of 20552821056 is 65012825502.

It is a happy number.

20552821056 is a `hidden beast` number, since 20 + 5 + 528 + 2 + 105 + 6 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20552821056.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1118116 + ... + 1136348.

Almost surely, 2^20552821056 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 20552821056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31308507360).

20552821056 is an abundant number, since it is smaller than the sum of its proper divisors (42064193664).

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

20552821056 is a wasteful number, since it uses less digits than its factorization.

20552821056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18373 (or 18360 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The spelling of 20552821056 in words is "twenty billion, five hundred fifty-two million, eight hundred twenty-one thousand, fifty-six".