20516722655 has 64 divisors (see below), whose sum is σ = 30618846720. Its totient is φ = 12988684800.

The previous prime is 20516722651. The next prime is 20516722661. The reversal of 20516722655 is 55622761502.

It is not a de Polignac number, because 20516722655 - 2² = 20516722651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20516722651) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 880100 + ... + 903110.

It is an arithmetic number, because the mean of its divisors is an integer number (478419480).

Almost surely, 2^20516722655 is an apocalyptic number.

20516722655 is a deficient number, since it is larger than the sum of its proper divisors (10102124065).

20516722655 is a wasteful number, since it uses less digits than its factorization.

20516722655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23112.

The product of its (nonzero) digits is 252000, while the sum is 41.

The spelling of 20516722655 in words is "twenty billion, five hundred sixteen million, seven hundred twenty-two thousand, six hundred fifty-five".