20445132889 has 2 divisors, whose sum is σ = 20445132890. Its totient is φ = 20445132888.

The previous prime is 20445132859. The next prime is 20445132937. The reversal of 20445132889 is 98823154402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19387777600 + 1057355289 = 139240^2 + 32517^2 .

It is a cyclic number.

It is not a de Polignac number, because 20445132889 - 2¹³ = 20445124697 is a prime.

It is not a weakly prime, because it can be changed into another prime (20445132859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10222566444 + 10222566445.

It is an arithmetic number, because the mean of its divisors is an integer number (10222566445).

Almost surely, 2^20445132889 is an apocalyptic number.

It is an amenable number.

20445132889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20445132889 is an equidigital number, since it uses as much as digits as its factorization.

20445132889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 552960, while the sum is 46.

It can be divided in two parts, 2044513 and 2889, that added together give a palindrome (2047402).

The spelling of 20445132889 in words is "twenty billion, four hundred forty-five million, one hundred thirty-two thousand, eight hundred eighty-nine".