20345031236437 has 2 divisors, whose sum is σ = 20345031236438. Its totient is φ = 20345031236436.

The previous prime is 20345031236317. The next prime is 20345031236447. The reversal of 20345031236437 is 73463213054302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10364240177316 + 9980791059121 = 3219354^2 + 3159239^2 .

It is a cyclic number.

It is not a de Polignac number, because 20345031236437 - 2³⁵ = 20310671498069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20345031236393 and 20345031236402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20345031236447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172515618218 + 10172515618219.

It is an arithmetic number, because the mean of its divisors is an integer number (10172515618219).

Almost surely, 2^{20345031236437} is an apocalyptic number.

It is an amenable number.

20345031236437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345031236437 is an equidigital number, since it uses as much as digits as its factorization.

20345031236437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 43.

The spelling of 20345031236437 in words is "twenty trillion, three hundred forty-five billion, thirty-one million, two hundred thirty-six thousand, four hundred thirty-seven".