20445223 has 2 divisors, whose sum is σ = 20445224. Its totient is φ = 20445222.

The previous prime is 20445193. The next prime is 20445233. The reversal of 20445223 is 32254402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20445223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20445194 and 20445203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20445233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10222611 + 10222612.

It is an arithmetic number, because the mean of its divisors is an integer number (10222612).

Almost surely, 2^20445223 is an apocalyptic number.

20445223 is a deficient number, since it is larger than the sum of its proper divisors (1).

20445223 is an equidigital number, since it uses as much as digits as its factorization.

20445223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 20445223 is about 4521.6394150794. The cubic root of 20445223 is about 273.4411995777.

Adding to 20445223 its reverse (32254402), we get a palindrome (52699625).

The spelling of 20445223 in words is "twenty million, four hundred forty-five thousand, two hundred twenty-three".