20404209263 has 4 divisors (see below), whose sum is σ = 20430606168. Its totient is φ = 20377812360.

The previous prime is 20404209229. The next prime is 20404209277. The reversal of 20404209263 is 36290240402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20404209263 - 2²² = 20400014959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404209223) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13197293 + ... + 13198838.

It is an arithmetic number, because the mean of its divisors is an integer number (5107651542).

Almost surely, 2^20404209263 is an apocalyptic number.

20404209263 is a deficient number, since it is larger than the sum of its proper divisors (26396905).

20404209263 is an equidigital number, since it uses as much as digits as its factorization.

20404209263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26396904.

The product of its (nonzero) digits is 20736, while the sum is 32.

Adding to 20404209263 its reverse (36290240402), we get a palindrome (56694449665).

The spelling of 20404209263 in words is "twenty billion, four hundred four million, two hundred nine thousand, two hundred sixty-three".