20242759709 has 2 divisors, whose sum is σ = 20242759710. Its totient is φ = 20242759708.

The previous prime is 20242759637. The next prime is 20242759711. The reversal of 20242759709 is 90795724202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18442454809 + 1800304900 = 135803^2 + 42430^2 .

It is a cyclic number.

It is not a de Polignac number, because 20242759709 - 2¹² = 20242755613 is a prime.

It is a Sophie Germain prime.

Together with 20242759711, it forms a pair of twin primes.

It is a Chen 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 (20242759759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10121379854 + 10121379855.

It is an arithmetic number, because the mean of its divisors is an integer number (10121379855).

Almost surely, 2^20242759709 is an apocalyptic number.

It is an amenable number.

20242759709 is a deficient number, since it is larger than the sum of its proper divisors (1).

20242759709 is an equidigital number, since it uses as much as digits as its factorization.

20242759709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 20242759709 in words is "twenty billion, two hundred forty-two million, seven hundred fifty-nine thousand, seven hundred nine".