20625223 has 4 divisors (see below), whose sum is σ = 20634328. Its totient is φ = 20616120.

The previous prime is 20625217. The next prime is 20625239. The reversal of 20625223 is 32252602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20625223 - 2⁵ = 20625191 is a prime.

It is the 4542-nd Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20625194 and 20625203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20625263) by changing a digit.

It is a nontrivial repunit in base 4541.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1813 + ... + 6673.

It is an arithmetic number, because the mean of its divisors is an integer number (5158582).

Almost surely, 2^20625223 is an apocalyptic number.

20625223 is a deficient number, since it is larger than the sum of its proper divisors (9105).

20625223 is an equidigital number, since it uses as much as digits as its factorization.

20625223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9104.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 20625223 is about 4541.5000825718. The cubic root of 20625223 is about 274.2413159913.

Adding to 20625223 its reverse (32252602), we get a palindrome (52877825).

The spelling of 20625223 in words is "twenty million, six hundred twenty-five thousand, two hundred twenty-three".