20563023031 has 4 divisors (see below), whose sum is σ = 20844708352. Its totient is φ = 20281337712.

The previous prime is 20563023029. The next prime is 20563023059. The reversal of 20563023031 is 13032036502.

It is a happy number.

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

It is not a de Polignac number, because 20563023031 - 2¹ = 20563023029 is a prime.

It is a super-2 number, since 2×20563023031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20563022987 and 20563023005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563023001) 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 in 3 ways as a sum of consecutive naturals, for example, 140842551 + ... + 140842696.

It is an arithmetic number, because the mean of its divisors is an integer number (5211177088).

Almost surely, 2^20563023031 is an apocalyptic number.

20563023031 is a deficient number, since it is larger than the sum of its proper divisors (281685321).

20563023031 is an equidigital number, since it uses as much as digits as its factorization.

20563023031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281685320.

The product of its (nonzero) digits is 3240, while the sum is 25.

Adding to 20563023031 its reverse (13032036502), we get a palindrome (33595059533).

The spelling of 20563023031 in words is "twenty billion, five hundred sixty-three million, twenty-three thousand, thirty-one".