20342040409 has 2 divisors, whose sum is σ = 20342040410. Its totient is φ = 20342040408.

The previous prime is 20342040403. The next prime is 20342040427. The reversal of 20342040409 is 90404024302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16348179600 + 3993860809 = 127860^2 + 63197^2 .

It is a cyclic number.

It is not a de Polignac number, because 20342040409 - 2⁵ = 20342040377 is a prime.

It is not a weakly prime, because it can be changed into another prime (20342040403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10171020204 + 10171020205.

It is an arithmetic number, because the mean of its divisors is an integer number (10171020205).

Almost surely, 2^20342040409 is an apocalyptic number.

It is an amenable number.

20342040409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20342040409 is an equidigital number, since it uses as much as digits as its factorization.

20342040409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 28.

The spelling of 20342040409 in words is "twenty billion, three hundred forty-two million, forty thousand, four hundred nine".