20403213031 has 2 divisors, whose sum is σ = 20403213032. Its totient is φ = 20403213030.

The previous prime is 20403213029. The next prime is 20403213049. The reversal of 20403213031 is 13031230402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20403213031 - 2¹ = 20403213029 is a prime.

It is a super-2 number, since 2×20403213031² (a number of 21 digits) contains 22 as substring.

Together with 20403213029, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20403213331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201606515 + 10201606516.

It is an arithmetic number, because the mean of its divisors is an integer number (10201606516).

Almost surely, 2^20403213031 is an apocalyptic number.

20403213031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403213031 is an equidigital number, since it uses as much as digits as its factorization.

20403213031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 20403213031 its reverse (13031230402), we get a palindrome (33434443433).

The spelling of 20403213031 in words is "twenty billion, four hundred three million, two hundred thirteen thousand, thirty-one".