20548457 has 4 divisors (see below), whose sum is σ = 20562516. Its totient is φ = 20534400.

The previous prime is 20548439. The next prime is 20548459. The reversal of 20548457 is 75484502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7123561 + 13424896 = 2669^2 + 3664^2 .

It is a cyclic number.

It is not a de Polignac number, because 20548457 - 2⁸ = 20548201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20548459) 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 in 3 ways as a sum of consecutive naturals, for example, 4544 + ... + 7857.

It is an arithmetic number, because the mean of its divisors is an integer number (5140629).

Almost surely, 2^20548457 is an apocalyptic number.

It is an amenable number.

20548457 is a deficient number, since it is larger than the sum of its proper divisors (14059).

20548457 is a wasteful number, since it uses less digits than its factorization.

20548457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14058.

The product of its (nonzero) digits is 44800, while the sum is 35.

The square root of 20548457 is about 4533.0405910382. The cubic root of 20548457 is about 273.9006557285.

The spelling of 20548457 in words is "twenty million, five hundred forty-eight thousand, four hundred fifty-seven".