20355112223 has 4 divisors (see below), whose sum is σ = 20373336360. Its totient is φ = 20336888088.

The previous prime is 20355112199. The next prime is 20355112291. The reversal of 20355112223 is 32221155302.

It is a happy number.

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 20355112223 - 2²⁸ = 20086676767 is a prime.

It is a super-2 number, since 2×20355112223² (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 = 20355112192 and 20355112201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355112423) 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, 9110393 + ... + 9112626.

It is an arithmetic number, because the mean of its divisors is an integer number (5093334090).

Almost surely, 2^20355112223 is an apocalyptic number.

20355112223 is a deficient number, since it is larger than the sum of its proper divisors (18224137).

20355112223 is a wasteful number, since it uses less digits than its factorization.

20355112223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18224136.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 20355112223 its reverse (32221155302), we get a palindrome (52576267525).

The spelling of 20355112223 in words is "twenty billion, three hundred fifty-five million, one hundred twelve thousand, two hundred twenty-three".