20545423 has 2 divisors, whose sum is σ = 20545424. Its totient is φ = 20545422.

The previous prime is 20545411. The next prime is 20545433. The reversal of 20545423 is 32454502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20545423 - 2²¹ = 18448271 is a prime.

It is a super-2 number, since 2×20545423² = 844228812497858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20545433) 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, 10272711 + 10272712.

It is an arithmetic number, because the mean of its divisors is an integer number (10272712).

Almost surely, 2^20545423 is an apocalyptic number.

20545423 is a deficient number, since it is larger than the sum of its proper divisors (1).

20545423 is an equidigital number, since it uses as much as digits as its factorization.

20545423 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 20545423 is about 4532.7059247209. The cubic root of 20545423 is about 273.8871744974.

Adding to 20545423 its reverse (32454502), we get a palindrome (52999925).

The spelling of 20545423 in words is "twenty million, five hundred forty-five thousand, four hundred twenty-three".