20555530051 has 8 divisors (see below), whose sum is σ = 23641666400. Its totient is φ = 17506801728.

The previous prime is 20555530043. The next prime is 20555530081. The reversal of 20555530051 is 15003555502.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20555530051 - 2³ = 20555530043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20555529995 and 20555530022.

It is not an unprimeable number, because it can be changed into a prime (20555530001) 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, 9350826 + ... + 9353023.

It is an arithmetic number, because the mean of its divisors is an integer number (2955208300).

Almost surely, 2^20555530051 is an apocalyptic number.

20555530051 is a deficient number, since it is larger than the sum of its proper divisors (3086136349).

20555530051 is a wasteful number, since it uses less digits than its factorization.

20555530051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18704013.

The product of its (nonzero) digits is 18750, while the sum is 31.

The spelling of 20555530051 in words is "twenty billion, five hundred fifty-five million, five hundred thirty thousand, fifty-one".