20420232389 has 2 divisors, whose sum is σ = 20420232390. Its totient is φ = 20420232388.

The previous prime is 20420232341. The next prime is 20420232421. The reversal of 20420232389 is 98323202402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11782017025 + 8638215364 = 108545^2 + 92942^2 .

It is a cyclic number.

It is not a de Polignac number, because 20420232389 - 2¹² = 20420228293 is a prime.

It is a Sophie Germain 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 (20420232319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210116194 + 10210116195.

It is an arithmetic number, because the mean of its divisors is an integer number (10210116195).

Almost surely, 2^20420232389 is an apocalyptic number.

It is an amenable number.

20420232389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420232389 is an equidigital number, since it uses as much as digits as its factorization.

20420232389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 20420232389 in words is "twenty billion, four hundred twenty million, two hundred thirty-two thousand, three hundred eighty-nine".