20400331013 has 4 divisors (see below), whose sum is σ = 20402548320. Its totient is φ = 20398113708.

The previous prime is 20400330959. The next prime is 20400331033. The reversal of 20400331013 is 31013300402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20400331013 - 2⁸ = 20400330757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20400330982 and 20400331000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400331033) 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, 1094795 + ... + 1113272.

It is an arithmetic number, because the mean of its divisors is an integer number (5100637080).

Almost surely, 2^20400331013 is an apocalyptic number.

It is an amenable number.

20400331013 is a deficient number, since it is larger than the sum of its proper divisors (2217307).

20400331013 is an equidigital number, since it uses as much as digits as its factorization.

20400331013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217306.

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

Adding to 20400331013 its reverse (31013300402), we get a palindrome (51413631415).

The spelling of 20400331013 in words is "twenty billion, four hundred million, three hundred thirty-one thousand, thirteen".