20390129093 has 2 divisors, whose sum is σ = 20390129094. Its totient is φ = 20390129092.

The previous prime is 20390129087. The next prime is 20390129153. The reversal of 20390129093 is 39092109302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20378419009 + 11710084 = 142753^2 + 3422^2 .

It is a cyclic number.

It is not a de Polignac number, because 20390129093 - 2¹⁸ = 20389866949 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20390129003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10195064546 + 10195064547.

It is an arithmetic number, because the mean of its divisors is an integer number (10195064547).

Almost surely, 2^20390129093 is an apocalyptic number.

It is an amenable number.

20390129093 is a deficient number, since it is larger than the sum of its proper divisors (1).

20390129093 is an equidigital number, since it uses as much as digits as its factorization.

20390129093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 38.

The spelling of 20390129093 in words is "twenty billion, three hundred ninety million, one hundred twenty-nine thousand, ninety-three".