20000198819 has 2 divisors, whose sum is σ = 20000198820. Its totient is φ = 20000198818.

The previous prime is 20000198809. The next prime is 20000198821. The reversal of 20000198819 is 91889100002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20000198819 - 2²⁰ = 19999150243 is a prime.

It is a super-2 number, since 2×20000198819² (a number of 21 digits) contains 22 as substring.

Together with 20000198821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20000198809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000099409 + 10000099410.

It is an arithmetic number, because the mean of its divisors is an integer number (10000099410).

Almost surely, 2^20000198819 is an apocalyptic number.

20000198819 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000198819 is an equidigital number, since it uses as much as digits as its factorization.

20000198819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 38.

The spelling of 20000198819 in words is "twenty billion, one hundred ninety-eight thousand, eight hundred nineteen".