20440131031 has 4 divisors (see below), whose sum is σ = 20455819312. Its totient is φ = 20424442752.

The previous prime is 20440131017. The next prime is 20440131043. The reversal of 20440131031 is 13013104402.

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

It is a cyclic number.

It is not a de Polignac number, because 20440131031 - 2²³ = 20431742423 is a prime.

It is a super-2 number, since 2×20440131031² (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 (20440131071) 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, 7842186 + ... + 7844791.

It is an arithmetic number, because the mean of its divisors is an integer number (5113954828).

Almost surely, 2^20440131031 is an apocalyptic number.

20440131031 is a deficient number, since it is larger than the sum of its proper divisors (15688281).

20440131031 is a wasteful number, since it uses less digits than its factorization.

20440131031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15688280.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20440131031 its reverse (13013104402), we get a palindrome (33453235433).

The spelling of 20440131031 in words is "twenty billion, four hundred forty million, one hundred thirty-one thousand, thirty-one".