20000012309 has 2 divisors, whose sum is σ = 20000012310. Its totient is φ = 20000012308.

The previous prime is 20000012303. The next prime is 20000012341. The reversal of 20000012309 is 90321000002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19570611025 + 429401284 = 139895^2 + 20722^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000012309 - 2⁴ = 20000012293 is a prime.

It is a super-2 number, since 2×20000012309² (a number of 21 digits) contains 22 as substring.

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 (20000012303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000006154 + 10000006155.

It is an arithmetic number, because the mean of its divisors is an integer number (10000006155).

Almost surely, 2^20000012309 is an apocalyptic number.

It is an amenable number.

20000012309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000012309 is an equidigital number, since it uses as much as digits as its factorization.

20000012309 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 20000012309 in words is "twenty billion, twelve thousand, three hundred nine".