20203120009 has 2 divisors, whose sum is σ = 20203120010. Its totient is φ = 20203120008.

The previous prime is 20203119997. The next prime is 20203120013. The reversal of 20203120009 is 90002130202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14334793984 + 5868326025 = 119728^2 + 76605^2 .

It is a cyclic number.

It is not a de Polignac number, because 20203120009 - 2⁵ = 20203119977 is a prime.

It is not a weakly prime, because it can be changed into another prime (20203120039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101560004 + 10101560005.

It is an arithmetic number, because the mean of its divisors is an integer number (10101560005).

Almost surely, 2^20203120009 is an apocalyptic number.

It is an amenable number.

20203120009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20203120009 is an equidigital number, since it uses as much as digits as its factorization.

20203120009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The spelling of 20203120009 in words is "twenty billion, two hundred three million, one hundred twenty thousand, nine".