20321013203 has 4 divisors (see below), whose sum is σ = 20330418888. Its totient is φ = 20311607520.

The previous prime is 20321013191. The next prime is 20321013241. The reversal of 20321013203 is 30231012302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30231012302 = 2 ⋅15115506151.

It is a cyclic number.

It is not a de Polignac number, because 20321013203 - 2¹⁶ = 20320947667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20321013283) 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, 4699601 + ... + 4703922.

It is an arithmetic number, because the mean of its divisors is an integer number (5082604722).

Almost surely, 2^20321013203 is an apocalyptic number.

20321013203 is a deficient number, since it is larger than the sum of its proper divisors (9405685).

20321013203 is an equidigital number, since it uses as much as digits as its factorization.

20321013203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9405684.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 20321013203 its reverse (30231012302), we get a palindrome (50552025505).

Subtracting 20321013203 from its reverse (30231012302), we obtain a palindrome (9909999099).

The spelling of 20321013203 in words is "twenty billion, three hundred twenty-one million, thirteen thousand, two hundred three".