20346142009 has 2 divisors, whose sum is σ = 20346142010. Its totient is φ = 20346142008.

The previous prime is 20346142007. The next prime is 20346142027. The reversal of 20346142009 is 90024164302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20022250000 + 323892009 = 141500^2 + 17997^2 .

It is a cyclic number.

It is not a de Polignac number, because 20346142009 - 2¹ = 20346142007 is a prime.

Together with 20346142007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20346142007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10173071004 + 10173071005.

It is an arithmetic number, because the mean of its divisors is an integer number (10173071005).

Almost surely, 2^20346142009 is an apocalyptic number.

It is an amenable number.

20346142009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20346142009 is an equidigital number, since it uses as much as digits as its factorization.

20346142009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 20346142009 in words is "twenty billion, three hundred forty-six million, one hundred forty-two thousand, nine".