20552165550 has 144 divisors (see below), whose sum is σ = 64393274400. Its totient is φ = 4697602560.

The previous prime is 20552165477. The next prime is 20552165597. The reversal of 20552165550 is 5556125502.

20552165550 is a `hidden beast` number, since 2 + 0 + 552 + 1 + 6 + 55 + 50 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 87774 + ... + 220926.

Almost surely, 2^20552165550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20552165550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32196637200).

20552165550 is an abundant number, since it is smaller than the sum of its proper divisors (43841108850).

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

20552165550 is a wasteful number, since it uses less digits than its factorization.

20552165550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133192 (or 133170 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 36.

The spelling of 20552165550 in words is "twenty billion, five hundred fifty-two million, one hundred sixty-five thousand, five hundred fifty".