20638062989 has 2 divisors, whose sum is σ = 20638062990. Its totient is φ = 20638062988.

The previous prime is 20638062983. The next prime is 20638063049. The reversal of 20638062989 is 98926083602.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18182364964 + 2455698025 = 134842^2 + 49555^2 .

It is a cyclic number.

It is not a de Polignac number, because 20638062989 - 2²⁸ = 20369627533 is a prime.

It is a super-2 number, since 2×20638062989² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20638062989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20638062983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10319031494 + 10319031495.

It is an arithmetic number, because the mean of its divisors is an integer number (10319031495).

Almost surely, 2^20638062989 is an apocalyptic number.

It is an amenable number.

20638062989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20638062989 is an equidigital number, since it uses as much as digits as its factorization.

20638062989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 53.

The spelling of 20638062989 in words is "twenty billion, six hundred thirty-eight million, sixty-two thousand, nine hundred eighty-nine".