20004698849 has 2 divisors, whose sum is σ = 20004698850. Its totient is φ = 20004698848.

The previous prime is 20004698843. The next prime is 20004698851. The reversal of 20004698849 is 94889640002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14448040000 + 5556658849 = 120200^2 + 74543^2 .

It is a cyclic number.

It is not a de Polignac number, because 20004698849 - 2¹² = 20004694753 is a prime.

Together with 20004698851, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20004698797 and 20004698806.

It is not a weakly prime, because it can be changed into another prime (20004698843) 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, 10002349424 + 10002349425.

It is an arithmetic number, because the mean of its divisors is an integer number (10002349425).

Almost surely, 2^20004698849 is an apocalyptic number.

It is an amenable number.

20004698849 is a deficient number, since it is larger than the sum of its proper divisors (1).

20004698849 is an equidigital number, since it uses as much as digits as its factorization.

20004698849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 995328, while the sum is 50.

The spelling of 20004698849 in words is "twenty billion, four million, six hundred ninety-eight thousand, eight hundred forty-nine".