20440205131 has 2 divisors, whose sum is σ = 20440205132. Its totient is φ = 20440205130.

The previous prime is 20440205113. The next prime is 20440205143. The reversal of 20440205131 is 13150204402.

Together with previous prime (20440205113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20440205131 - 2¹¹ = 20440203083 is a prime.

It is a super-2 number, since 2×20440205131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20440205161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220102565 + 10220102566.

It is an arithmetic number, because the mean of its divisors is an integer number (10220102566).

Almost surely, 2^20440205131 is an apocalyptic number.

20440205131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20440205131 is an equidigital number, since it uses as much as digits as its factorization.

20440205131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 20440205131 its reverse (13150204402), we get a palindrome (33590409533).

The spelling of 20440205131 in words is "twenty billion, four hundred forty million, two hundred five thousand, one hundred thirty-one".