20431534323133 has 2 divisors, whose sum is σ = 20431534323134. Its totient is φ = 20431534323132.

The previous prime is 20431534323131. The next prime is 20431534323217. The reversal of 20431534323133 is 33132343513402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13324522176729 + 7107012146404 = 3650277^2 + 2665898^2 .

It is a cyclic number.

It is not a de Polignac number, because 20431534323133 - 2¹ = 20431534323131 is a prime.

Together with 20431534323131, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20431534323092 and 20431534323101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20431534323131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215767161566 + 10215767161567.

It is an arithmetic number, because the mean of its divisors is an integer number (10215767161567).

Almost surely, 2^{20431534323133} is an apocalyptic number.

It is an amenable number.

20431534323133 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431534323133 is an equidigital number, since it uses as much as digits as its factorization.

20431534323133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 37.

Adding to 20431534323133 its reverse (33132343513402), we get a palindrome (53563877836535).

The spelling of 20431534323133 in words is "twenty trillion, four hundred thirty-one billion, five hundred thirty-four million, three hundred twenty-three thousand, one hundred thirty-three".