20655660051 has 24 divisors (see below), whose sum is σ = 32161447136. Its totient is φ = 12699141120.

The previous prime is 20655660049. The next prime is 20655660061. The reversal of 20655660051 is 15006655602.

It is a happy number.

It is not a de Polignac number, because 20655660051 - 2¹ = 20655660049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20655659988 and 20655660015.

It is not an unprimeable number, because it can be changed into a prime (20655660001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41331 + ... + 207411.

Almost surely, 2^20655660051 is an apocalyptic number.

20655660051 is a deficient number, since it is larger than the sum of its proper divisors (11505787085).

20655660051 is a wasteful number, since it uses less digits than its factorization.

20655660051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167163 (or 167160 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 20655660051 in words is "twenty billion, six hundred fifty-five million, six hundred sixty thousand, fifty-one".