20042343109 has 2 divisors, whose sum is σ = 20042343110. Its totient is φ = 20042343108.

The previous prime is 20042343077. The next prime is 20042343143. The reversal of 20042343109 is 90134324002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18810122500 + 1232220609 = 137150^2 + 35103^2 .

It is a cyclic number.

It is not a de Polignac number, because 20042343109 - 2⁵ = 20042343077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20042343709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10021171554 + 10021171555.

It is an arithmetic number, because the mean of its divisors is an integer number (10021171555).

Almost surely, 2^20042343109 is an apocalyptic number.

It is an amenable number.

20042343109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20042343109 is an equidigital number, since it uses as much as digits as its factorization.

20042343109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The spelling of 20042343109 in words is "twenty billion, forty-two million, three hundred forty-three thousand, one hundred nine".