20445115445 has 4 divisors (see below), whose sum is σ = 24534138540. Its totient is φ = 16356092352.

The previous prime is 20445115441. The next prime is 20445115487. The reversal of 20445115445 is 54451154402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4405906129 + 16039209316 = 66377^2 + 126646^2 .

It is a cyclic number.

It is not a de Polignac number, because 20445115445 - 2² = 20445115441 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20445115441) 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, 2044511540 + ... + 2044511549.

It is an arithmetic number, because the mean of its divisors is an integer number (6133534635).

Almost surely, 2^20445115445 is an apocalyptic number.

It is an amenable number.

20445115445 is a deficient number, since it is larger than the sum of its proper divisors (4089023095).

20445115445 is an equidigital number, since it uses as much as digits as its factorization.

20445115445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4089023094.

The product of its (nonzero) digits is 64000, while the sum is 35.

Adding to 20445115445 its reverse (54451154402), we get a palindrome (74896269847).

The spelling of 20445115445 in words is "twenty billion, four hundred forty-five million, one hundred fifteen thousand, four hundred forty-five".