20903696309 has 2 divisors, whose sum is σ = 20903696310. Its totient is φ = 20903696308.

The previous prime is 20903696299. The next prime is 20903696311. The reversal of 20903696309 is 90369630902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20605167025 + 298529284 = 143545^2 + 17278^2 .

It is a cyclic number.

It is not a de Polignac number, because 20903696309 - 2⁴ = 20903696293 is a prime.

It is a Sophie Germain prime.

Together with 20903696311, it forms a pair of twin primes.

It is a Chen 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 (20903696369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10451848154 + 10451848155.

It is an arithmetic number, because the mean of its divisors is an integer number (10451848155).

Almost surely, 2^20903696309 is an apocalyptic number.

It is an amenable number.

20903696309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20903696309 is an equidigital number, since it uses as much as digits as its factorization.

20903696309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 472392, while the sum is 47.

The spelling of 20903696309 in words is "twenty billion, nine hundred three million, six hundred ninety-six thousand, three hundred nine".