20001200309 has 2 divisors, whose sum is σ = 20001200310. Its totient is φ = 20001200308.

The previous prime is 20001200221. The next prime is 20001200339. The reversal of 20001200309 is 90300210002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17629997284 + 2371203025 = 132778^2 + 48695^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001200309 - 2³² = 15706233013 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 (20001200339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000600154 + 10000600155.

It is an arithmetic number, because the mean of its divisors is an integer number (10000600155).

Almost surely, 2^20001200309 is an apocalyptic number.

It is an amenable number.

20001200309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001200309 is an equidigital number, since it uses as much as digits as its factorization.

20001200309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

The spelling of 20001200309 in words is "twenty billion, one million, two hundred thousand, three hundred nine".