20431332461 has 2 divisors, whose sum is σ = 20431332462. Its totient is φ = 20431332460.

The previous prime is 20431332431. The next prime is 20431332463. The reversal of 20431332461 is 16423313402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16830132361 + 3601200100 = 129731^2 + 60010^2 .

It is a cyclic number.

It is not a de Polignac number, because 20431332461 - 2¹⁴ = 20431316077 is a prime.

It is a super-2 number, since 2×20431332461² (a number of 21 digits) contains 22 as substring.

Together with 20431332463, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20431332463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215666230 + 10215666231.

It is an arithmetic number, because the mean of its divisors is an integer number (10215666231).

Almost surely, 2^20431332461 is an apocalyptic number.

It is an amenable number.

20431332461 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431332461 is an equidigital number, since it uses as much as digits as its factorization.

20431332461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 20431332461 its reverse (16423313402), we get a palindrome (36854645863).

The spelling of 20431332461 in words is "twenty billion, four hundred thirty-one million, three hundred thirty-two thousand, four hundred sixty-one".