20403254189 has 2 divisors, whose sum is σ = 20403254190. Its totient is φ = 20403254188.

The previous prime is 20403254149. The next prime is 20403254203. The reversal of 20403254189 is 98145230402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16158731689 + 4244522500 = 127117^2 + 65150^2 .

It is a cyclic number.

It is not a de Polignac number, because 20403254189 - 2²⁰ = 20402205613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20403254129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201627094 + 10201627095.

It is an arithmetic number, because the mean of its divisors is an integer number (10201627095).

Almost surely, 2^20403254189 is an apocalyptic number.

It is an amenable number.

20403254189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403254189 is an equidigital number, since it uses as much as digits as its factorization.

20403254189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 20403254189 in words is "twenty billion, four hundred three million, two hundred fifty-four thousand, one hundred eighty-nine".