20454523 has 2 divisors, whose sum is σ = 20454524. Its totient is φ = 20454522.

The previous prime is 20454481. The next prime is 20454529. The reversal of 20454523 is 32545402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20454523 is a prime.

It is a super-2 number, since 2×20454523² = 836775022315058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20454529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10227261 + 10227262.

It is an arithmetic number, because the mean of its divisors is an integer number (10227262).

Almost surely, 2^20454523 is an apocalyptic number.

20454523 is a deficient number, since it is larger than the sum of its proper divisors (1).

20454523 is an equidigital number, since it uses as much as digits as its factorization.

20454523 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 20454523 is about 4522.6676862224. The cubic root of 20454523 is about 273.4826537220.

Adding to 20454523 its reverse (32545402), we get a palindrome (52999925).

The spelling of 20454523 in words is "twenty million, four hundred fifty-four thousand, five hundred twenty-three".