20511327019 has 2 divisors, whose sum is σ = 20511327020. Its totient is φ = 20511327018.

The previous prime is 20511327007. The next prime is 20511327047. The reversal of 20511327019 is 91072311502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20511327019 - 2⁵ = 20511326987 is a prime.

It is a super-2 number, since 2×20511327019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20511327079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10255663509 + 10255663510.

It is an arithmetic number, because the mean of its divisors is an integer number (10255663510).

Almost surely, 2^20511327019 is an apocalyptic number.

20511327019 is a deficient number, since it is larger than the sum of its proper divisors (1).

20511327019 is an equidigital number, since it uses as much as digits as its factorization.

20511327019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 31.

The spelling of 20511327019 in words is "twenty billion, five hundred eleven million, three hundred twenty-seven thousand, nineteen".