20558044919 has 2 divisors, whose sum is σ = 20558044920. Its totient is φ = 20558044918.

The previous prime is 20558044853. The next prime is 20558044921. The reversal of 20558044919 is 91944085502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20558044919 is a prime.

It is a super-2 number, since 2×20558044919² (a number of 21 digits) contains 22 as substring.

Together with 20558044921, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20558044939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10279022459 + 10279022460.

It is an arithmetic number, because the mean of its divisors is an integer number (10279022460).

Almost surely, 2^20558044919 is an apocalyptic number.

20558044919 is a deficient number, since it is larger than the sum of its proper divisors (1).

20558044919 is an equidigital number, since it uses as much as digits as its factorization.

20558044919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 20558044919 in words is "twenty billion, five hundred fifty-eight million, forty-four thousand, nine hundred nineteen".