20454923 has 2 divisors, whose sum is σ = 20454924. Its totient is φ = 20454922.

The previous prime is 20454911. The next prime is 20454943. The reversal of 20454923 is 32945402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20454923 - 2¹² = 20450827 is a prime.

It is not a weakly prime, because it can be changed into another prime (20454943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10227461 + 10227462.

It is an arithmetic number, because the mean of its divisors is an integer number (10227462).

Almost surely, 2^20454923 is an apocalyptic number.

20454923 is a deficient number, since it is larger than the sum of its proper divisors (1).

20454923 is an equidigital number, since it uses as much as digits as its factorization.

20454923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 20454923 is about 4522.7119076943. The cubic root of 20454923 is about 273.4844364140.

The spelling of 20454923 in words is "twenty million, four hundred fifty-four thousand, nine hundred twenty-three".