20563161223 has 12 divisors (see below), whose sum is σ = 23829725592. Its totient is φ = 17594145920.

The previous prime is 20563161209. The next prime is 20563161259. The reversal of 20563161223 is 32216136502.

It is a happy number.

It is not a de Polignac number, because 20563161223 - 2¹³ = 20563153031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563165223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3231040 + ... + 3237397.

It is an arithmetic number, because the mean of its divisors is an integer number (1985810466).

Almost surely, 2^20563161223 is an apocalyptic number.

20563161223 is a deficient number, since it is larger than the sum of its proper divisors (3266564369).

20563161223 is a wasteful number, since it uses less digits than its factorization.

20563161223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6468482 (or 6468465 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

Adding to 20563161223 its reverse (32216136502), we get a palindrome (52779297725).

The spelling of 20563161223 in words is "twenty billion, five hundred sixty-three million, one hundred sixty-one thousand, two hundred twenty-three".