20559223 has 2 divisors, whose sum is σ = 20559224. Its totient is φ = 20559222.

The previous prime is 20559193. The next prime is 20559233. The reversal of 20559223 is 32295502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20559223 - 2⁵ = 20559191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20559191 and 20559200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20559233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10279611 + 10279612.

It is an arithmetic number, because the mean of its divisors is an integer number (10279612).

Almost surely, 2^20559223 is an apocalyptic number.

20559223 is a deficient number, since it is larger than the sum of its proper divisors (1).

20559223 is an equidigital number, since it uses as much as digits as its factorization.

20559223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 20559223 is about 4534.2279386903. The cubic root of 20559223 is about 273.9484825089.

The spelling of 20559223 in words is "twenty million, five hundred fifty-nine thousand, two hundred twenty-three".