20203031321 has 6 divisors (see below), whose sum is σ = 22206637866. Its totient is φ = 18366392000.

The previous prime is 20203031309. The next prime is 20203031347. The reversal of 20203031321 is 12313030202.

It can be written as a sum of positive squares in only one way, i.e., 19899052096 + 303979225 = 141064^2 + 17435^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20203031321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20203031321.

It is not an unprimeable number, because it can be changed into a prime (20203031351) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 83483480 + ... + 83483721.

It is an arithmetic number, because the mean of its divisors is an integer number (3701106311).

Almost surely, 2^20203031321 is an apocalyptic number.

It is an amenable number.

20203031321 is a deficient number, since it is larger than the sum of its proper divisors (2003606545).

20203031321 is a wasteful number, since it uses less digits than its factorization.

20203031321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166967223 (or 166967212 counting only the distinct ones).

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

Adding to 20203031321 its reverse (12313030202), we get a palindrome (32516061523).

The spelling of 20203031321 in words is "twenty billion, two hundred three million, thirty-one thousand, three hundred twenty-one".