20637974113 has 2 divisors, whose sum is σ = 20637974114. Its totient is φ = 20637974112.

The previous prime is 20637974111. The next prime is 20637974117. The reversal of 20637974113 is 31147973602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14398080064 + 6239894049 = 119992^2 + 78993^2 .

It is a cyclic number.

It is not a de Polignac number, because 20637974113 - 2¹ = 20637974111 is a prime.

Together with 20637974111, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20637974113.

It is not a weakly prime, because it can be changed into another prime (20637974111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10318987056 + 10318987057.

It is an arithmetic number, because the mean of its divisors is an integer number (10318987057).

Almost surely, 2^20637974113 is an apocalyptic number.

It is an amenable number.

20637974113 is a deficient number, since it is larger than the sum of its proper divisors (1).

20637974113 is an equidigital number, since it uses as much as digits as its factorization.

20637974113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 43.

The spelling of 20637974113 in words is "twenty billion, six hundred thirty-seven million, nine hundred seventy-four thousand, one hundred thirteen".