20455423 has 2 divisors, whose sum is σ = 20455424. Its totient is φ = 20455422.

The previous prime is 20455417. The next prime is 20455439. The reversal of 20455423 is 32455402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20455423 - 2⁹ = 20454911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20455453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10227711 + 10227712.

It is an arithmetic number, because the mean of its divisors is an integer number (10227712).

Almost surely, 2^20455423 is an apocalyptic number.

20455423 is a deficient number, since it is larger than the sum of its proper divisors (1).

20455423 is an equidigital number, since it uses as much as digits as its factorization.

20455423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 20455423 is about 4522.7671839262. The cubic root of 20455423 is about 273.4866647465.

The spelling of 20455423 in words is "twenty million, four hundred fifty-five thousand, four hundred twenty-three".