20442155389 has 2 divisors, whose sum is σ = 20442155390. Its totient is φ = 20442155388.

The previous prime is 20442155387. The next prime is 20442155411. The reversal of 20442155389 is 98355124402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20440420900 + 1734489 = 142970^2 + 1317^2 .

It is a cyclic number.

It is not a de Polignac number, because 20442155389 - 2¹ = 20442155387 is a prime.

Together with 20442155387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20442155387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221077694 + 10221077695.

It is an arithmetic number, because the mean of its divisors is an integer number (10221077695).

Almost surely, 2^20442155389 is an apocalyptic number.

It is an amenable number.

20442155389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442155389 is an equidigital number, since it uses as much as digits as its factorization.

20442155389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 20442155389 in words is "twenty billion, four hundred forty-two million, one hundred fifty-five thousand, three hundred eighty-nine".