20510423205 has 16 divisors (see below), whose sum is σ = 33875280384. Its totient is φ = 10586024640.

The previous prime is 20510423191. The next prime is 20510423207. The reversal of 20510423205 is 50232401502.

It is not a de Polignac number, because 20510423205 - 2¹⁵ = 20510390437 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20510423207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22053754 + ... + 22054683.

It is an arithmetic number, because the mean of its divisors is an integer number (2117205024).

Almost surely, 2^20510423205 is an apocalyptic number.

It is an amenable number.

20510423205 is a deficient number, since it is larger than the sum of its proper divisors (13364857179).

20510423205 is a wasteful number, since it uses less digits than its factorization.

20510423205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44108476.

The product of its (nonzero) digits is 2400, while the sum is 24.

Adding to 20510423205 its reverse (50232401502), we get a palindrome (70742824707).

The spelling of 20510423205 in words is "twenty billion, five hundred ten million, four hundred twenty-three thousand, two hundred five".