20898230805 has 12 divisors (see below), whose sum is σ = 36223600140. Its totient is φ = 11145723072.

The previous prime is 20898230783. The next prime is 20898230833. The reversal of 20898230805 is 50803289802.

It can be written as a sum of positive squares in 2 ways, for example, as 14248480689 + 6649750116 = 119367^2 + 81546^2 .

It is not a de Polignac number, because 20898230805 - 2⁶ = 20898230741 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 464405129 = 20898230805 / (2 + 0 + 8 + 9 + 8 + 2 + 3 + 0 + 8 + 0 + 5).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232202520 + ... + 232202609.

It is an arithmetic number, because the mean of its divisors is an integer number (3018633345).

Almost surely, 2^20898230805 is an apocalyptic number.

It is an amenable number.

20898230805 is a deficient number, since it is larger than the sum of its proper divisors (15325369335).

20898230805 is a wasteful number, since it uses less digits than its factorization.

20898230805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464405140 (or 464405137 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 20898230805 in words is "twenty billion, eight hundred ninety-eight million, two hundred thirty thousand, eight hundred five".