20812384189 has 2 divisors, whose sum is σ = 20812384190. Its totient is φ = 20812384188.

The previous prime is 20812384123. The next prime is 20812384199. The reversal of 20812384189 is 98148321802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16452423289 + 4359960900 = 128267^2 + 66030^2 .

It is a cyclic number.

It is not a de Polignac number, because 20812384189 - 2⁹ = 20812383677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20812384199) 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, 10406192094 + 10406192095.

It is an arithmetic number, because the mean of its divisors is an integer number (10406192095).

Almost surely, 2^20812384189 is an apocalyptic number.

It is an amenable number.

20812384189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20812384189 is an equidigital number, since it uses as much as digits as its factorization.

20812384189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 221184, while the sum is 46.

The spelling of 20812384189 in words is "twenty billion, eight hundred twelve million, three hundred eighty-four thousand, one hundred eighty-nine".