20323111009 has 2 divisors, whose sum is σ = 20323111010. Its totient is φ = 20323111008.

The previous prime is 20323110991. The next prime is 20323111043. The reversal of 20323111009 is 90011132302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19160096400 + 1163014609 = 138420^2 + 34103^2 .

It is a cyclic number.

It is not a de Polignac number, because 20323111009 - 2¹¹ = 20323108961 is a prime.

It is not a weakly prime, because it can be changed into another prime (20323111079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10161555504 + 10161555505.

It is an arithmetic number, because the mean of its divisors is an integer number (10161555505).

Almost surely, 2^20323111009 is an apocalyptic number.

It is an amenable number.

20323111009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20323111009 is an equidigital number, since it uses as much as digits as its factorization.

20323111009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The spelling of 20323111009 in words is "twenty billion, three hundred twenty-three million, one hundred eleven thousand, nine".