20535223 has 4 divisors (see below), whose sum is σ = 20871928. Its totient is φ = 20198520.

The previous prime is 20535217. The next prime is 20535227. The reversal of 20535223 is 32253502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32253502 = 2 ⋅16126751.

It is a cyclic number.

It is not a de Polignac number, because 20535223 - 2⁹ = 20534711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20535194 and 20535203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20535227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168261 + ... + 168382.

It is an arithmetic number, because the mean of its divisors is an integer number (5217982).

Almost surely, 2^20535223 is an apocalyptic number.

20535223 is a deficient number, since it is larger than the sum of its proper divisors (336705).

20535223 is an equidigital number, since it uses as much as digits as its factorization.

20535223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336704.

The product of its (nonzero) digits is 1800, while the sum is 22.

The square root of 20535223 is about 4531.5806293169. The cubic root of 20535223 is about 273.8418422334.

Adding to 20535223 its reverse (32253502), we get a palindrome (52788725).

The spelling of 20535223 in words is "twenty million, five hundred thirty-five thousand, two hundred twenty-three".