20499333823 has 4 divisors (see below), whose sum is σ = 21160602688. Its totient is φ = 19838064960.

The previous prime is 20499333821. The next prime is 20499333857. The reversal of 20499333823 is 32833399402.

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 20499333823 - 2¹ = 20499333821 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 (20499333821) 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 in 3 ways as a sum of consecutive naturals, for example, 330634386 + ... + 330634447.

It is an arithmetic number, because the mean of its divisors is an integer number (5290150672).

Almost surely, 2^20499333823 is an apocalyptic number.

20499333823 is a deficient number, since it is larger than the sum of its proper divisors (661268865).

20499333823 is an equidigital number, since it uses as much as digits as its factorization.

20499333823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661268864.

The product of its (nonzero) digits is 839808, while the sum is 46.

The spelling of 20499333823 in words is "twenty billion, four hundred ninety-nine million, three hundred thirty-three thousand, eight hundred twenty-three".