20454547 has 2 divisors, whose sum is σ = 20454548. Its totient is φ = 20454546.

The previous prime is 20454529. The next prime is 20454557. The reversal of 20454547 is 74545402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20454547 - 2¹¹ = 20452499 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20454557) 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, 10227273 + 10227274.

It is an arithmetic number, because the mean of its divisors is an integer number (10227274).

Almost surely, 2^20454547 is an apocalyptic number.

20454547 is a deficient number, since it is larger than the sum of its proper divisors (1).

20454547 is an equidigital number, since it uses as much as digits as its factorization.

20454547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22400, while the sum is 31.

The square root of 20454547 is about 4522.6703395229. The cubic root of 20454547 is about 273.4827606841.

Adding to 20454547 its reverse (74545402), we get a palindrome (94999949).

The spelling of 20454547 in words is "twenty million, four hundred fifty-four thousand, five hundred forty-seven".