20420002345609 has 2 divisors, whose sum is σ = 20420002345610. Its totient is φ = 20420002345608.

The previous prime is 20420002345607. The next prime is 20420002345637. The reversal of 20420002345609 is 90654320002402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12430363051584 + 7989639294025 = 3525672^2 + 2826595^2 .

It is a cyclic number.

It is not a de Polignac number, because 20420002345609 - 2¹ = 20420002345607 is a prime.

Together with 20420002345607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20420002345601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210001172804 + 10210001172805.

It is an arithmetic number, because the mean of its divisors is an integer number (10210001172805).

Almost surely, 2^{20420002345609} is an apocalyptic number.

It is an amenable number.

20420002345609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420002345609 is an equidigital number, since it uses as much as digits as its factorization.

20420002345609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 20420002345609 in words is "twenty trillion, four hundred twenty billion, two million, three hundred forty-five thousand, six hundred nine".