20637722113 has 2 divisors, whose sum is σ = 20637722114. Its totient is φ = 20637722112.

The previous prime is 20637722087. The next prime is 20637722173. The reversal of 20637722113 is 31122773602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14614875664 + 6022846449 = 120892^2 + 77607^2 .

It is a cyclic number.

It is not a de Polignac number, because 20637722113 - 2²⁵ = 20604167681 is a prime.

It is not a weakly prime, because it can be changed into another prime (20637722173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10318861056 + 10318861057.

It is an arithmetic number, because the mean of its divisors is an integer number (10318861057).

Almost surely, 2^20637722113 is an apocalyptic number.

It is an amenable number.

20637722113 is a deficient number, since it is larger than the sum of its proper divisors (1).

20637722113 is an equidigital number, since it uses as much as digits as its factorization.

20637722113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 34.

The spelling of 20637722113 in words is "twenty billion, six hundred thirty-seven million, seven hundred twenty-two thousand, one hundred thirteen".