20403202031 has 4 divisors (see below), whose sum is σ = 20410681200. Its totient is φ = 20395722864.

The previous prime is 20403202021. The next prime is 20403202049. The reversal of 20403202031 is 13020230402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20403202031 is a prime.

It is a super-2 number, since 2×20403202031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20403202021) 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, 3735491 + ... + 3740948.

It is an arithmetic number, because the mean of its divisors is an integer number (5102670300).

Almost surely, 2^20403202031 is an apocalyptic number.

20403202031 is a deficient number, since it is larger than the sum of its proper divisors (7479169).

20403202031 is an equidigital number, since it uses as much as digits as its factorization.

20403202031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7479168.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 20403202031 its reverse (13020230402), we get a palindrome (33423432433).

The spelling of 20403202031 in words is "twenty billion, four hundred three million, two hundred two thousand, thirty-one".