20633405123 has 4 divisors (see below), whose sum is σ = 20971657728. Its totient is φ = 20295152520.

The previous prime is 20633405113. The next prime is 20633405159. The reversal of 20633405123 is 32150433602.

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 20633405123 - 2⁶ = 20633405059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20633405113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169126211 + ... + 169126332.

It is an arithmetic number, because the mean of its divisors is an integer number (5242914432).

Almost surely, 2^20633405123 is an apocalyptic number.

20633405123 is a deficient number, since it is larger than the sum of its proper divisors (338252605).

20633405123 is an equidigital number, since it uses as much as digits as its factorization.

20633405123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338252604.

The product of its (nonzero) digits is 12960, while the sum is 29.

Adding to 20633405123 its reverse (32150433602), we get a palindrome (52783838725).

The spelling of 20633405123 in words is "twenty billion, six hundred thirty-three million, four hundred five thousand, one hundred twenty-three".