20444223451 has 4 divisors (see below), whose sum is σ = 20919670552. Its totient is φ = 19968776352.

The previous prime is 20444223433. The next prime is 20444223487. The reversal of 20444223451 is 15432244402.

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

It is a cyclic number.

It is not a de Polignac number, because 20444223451 - 2²⁹ = 19907352539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20444923451) 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 in 3 ways as a sum of consecutive naturals, for example, 237723486 + ... + 237723571.

It is an arithmetic number, because the mean of its divisors is an integer number (5229917638).

Almost surely, 2^20444223451 is an apocalyptic number.

20444223451 is a deficient number, since it is larger than the sum of its proper divisors (475447101).

20444223451 is an equidigital number, since it uses as much as digits as its factorization.

20444223451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475447100.

The product of its (nonzero) digits is 30720, while the sum is 31.

Adding to 20444223451 its reverse (15432244402), we get a palindrome (35876467853).

The spelling of 20444223451 in words is "twenty billion, four hundred forty-four million, two hundred twenty-three thousand, four hundred fifty-one".