20445132489 has 4 divisors (see below), whose sum is σ = 27260176656. Its totient is φ = 13630088324.

The previous prime is 20445132413. The next prime is 20445132503. The reversal of 20445132489 is 98423154402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20445132489 - 2⁸ = 20445132233 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20445132489.

It is not an unprimeable number, because it can be changed into a prime (20445132889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3407522079 + ... + 3407522084.

It is an arithmetic number, because the mean of its divisors is an integer number (6815044164).

Almost surely, 2^20445132489 is an apocalyptic number.

It is an amenable number.

20445132489 is a deficient number, since it is larger than the sum of its proper divisors (6815044167).

20445132489 is an equidigital number, since it uses as much as digits as its factorization.

20445132489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6815044166.

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 20445132489 in words is "twenty billion, four hundred forty-five million, one hundred thirty-two thousand, four hundred eighty-nine".