20552512551 has 8 divisors (see below), whose sum is σ = 27415576320. Its totient is φ = 13695561912.

The previous prime is 20552512543. The next prime is 20552512567. The reversal of 20552512551 is 15521525502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20552512551 - 2³ = 20552512543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20552512051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1520431 + ... + 1533888.

It is an arithmetic number, because the mean of its divisors is an integer number (3426947040).

Almost surely, 2^20552512551 is an apocalyptic number.

20552512551 is a deficient number, since it is larger than the sum of its proper divisors (6863063769).

20552512551 is a wasteful number, since it uses less digits than its factorization.

20552512551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3056565.

The product of its (nonzero) digits is 25000, while the sum is 33.

The spelling of 20552512551 in words is "twenty billion, five hundred fifty-two million, five hundred twelve thousand, five hundred fifty-one".