20192819919 has 4 divisors (see below), whose sum is σ = 26923759896. Its totient is φ = 13461879944.

The previous prime is 20192819917. The next prime is 20192819947. The reversal of 20192819919 is 91991829102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20192819919 - 2¹ = 20192819917 is a prime.

It is a super-2 number, since 2×20192819919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20192819917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3365469984 + ... + 3365469989.

It is an arithmetic number, because the mean of its divisors is an integer number (6730939974).

Almost surely, 2^20192819919 is an apocalyptic number.

20192819919 is a deficient number, since it is larger than the sum of its proper divisors (6730939977).

20192819919 is an equidigital number, since it uses as much as digits as its factorization.

20192819919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6730939976.

The product of its (nonzero) digits is 209952, while the sum is 51.

The spelling of 20192819919 in words is "twenty billion, one hundred ninety-two million, eight hundred nineteen thousand, nine hundred nineteen".