20716202051 has 4 divisors (see below), whose sum is σ = 21616906512. Its totient is φ = 19815497592.

The previous prime is 20716202047. The next prime is 20716202083. The reversal of 20716202051 is 15020261702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20716202051 - 2² = 20716202047 is a prime.

It is a super-2 number, since 2×20716202051² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20716202051.

It is not an unprimeable number, because it can be changed into a prime (20716232051) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 450352196 + ... + 450352241.

It is an arithmetic number, because the mean of its divisors is an integer number (5404226628).

Almost surely, 2^20716202051 is an apocalyptic number.

20716202051 is a deficient number, since it is larger than the sum of its proper divisors (900704461).

20716202051 is an equidigital number, since it uses as much as digits as its factorization.

20716202051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900704460.

The product of its (nonzero) digits is 1680, while the sum is 26.

Adding to 20716202051 its reverse (15020261702), we get a palindrome (35736463753).

The spelling of 20716202051 in words is "twenty billion, seven hundred sixteen million, two hundred two thousand, fifty-one".