20040432331 has 2 divisors, whose sum is σ = 20040432332. Its totient is φ = 20040432330.

The previous prime is 20040432323. The next prime is 20040432407. The reversal of 20040432331 is 13323404002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20040432331 - 2³ = 20040432323 is a prime.

It is a super-2 number, since 2×20040432331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20040432301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10020216165 + 10020216166.

It is an arithmetic number, because the mean of its divisors is an integer number (10020216166).

Almost surely, 2^20040432331 is an apocalyptic number.

20040432331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20040432331 is an equidigital number, since it uses as much as digits as its factorization.

20040432331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 20040432331 its reverse (13323404002), we get a palindrome (33363836333).

The spelling of 20040432331 in words is "twenty billion, forty million, four hundred thirty-two thousand, three hundred thirty-one".