20511543446223 has 8 divisors (see below), whose sum is σ = 27388766654208. Its totient is φ = 13654341267864.

The previous prime is 20511543446209. The next prime is 20511543446243. The reversal of 20511543446223 is 32264434511502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20511543446223 - 2⁶ = 20511543446159 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20511543446243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5005255015 + ... + 5005259112.

It is an arithmetic number, because the mean of its divisors is an integer number (3423595831776).

Almost surely, 2^{20511543446223} is an apocalyptic number.

20511543446223 is a deficient number, since it is larger than the sum of its proper divisors (6877223207985).

20511543446223 is a wasteful number, since it uses less digits than its factorization.

20511543446223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10010514813.

The product of its (nonzero) digits is 691200, while the sum is 42.

Adding to 20511543446223 its reverse (32264434511502), we get a palindrome (52775977957725).

The spelling of 20511543446223 in words is "twenty trillion, five hundred eleven billion, five hundred forty-three million, four hundred forty-six thousand, two hundred twenty-three".