20456224563 has 4 divisors (see below), whose sum is σ = 27274966088. Its totient is φ = 13637483040.

The previous prime is 20456224549. The next prime is 20456224567. The reversal of 20456224563 is 36542265402.

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

It is not a de Polignac number, because 20456224563 - 2⁶ = 20456224499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20456224567) 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, 3409370758 + ... + 3409370763.

It is an arithmetic number, because the mean of its divisors is an integer number (6818741522).

Almost surely, 2^20456224563 is an apocalyptic number.

20456224563 is a deficient number, since it is larger than the sum of its proper divisors (6818741525).

20456224563 is an equidigital number, since it uses as much as digits as its factorization.

20456224563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6818741524.

The product of its (nonzero) digits is 345600, while the sum is 39.

Adding to 20456224563 its reverse (36542265402), we get a palindrome (56998489965).

The spelling of 20456224563 in words is "twenty billion, four hundred fifty-six million, two hundred twenty-four thousand, five hundred sixty-three".