20548817 has 2 divisors, whose sum is σ = 20548818. Its totient is φ = 20548816.

The previous prime is 20548813. The next prime is 20548819. The reversal of 20548817 is 71884502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11282881 + 9265936 = 3359^2 + 3044^2 .

It is a cyclic number.

It is not a de Polignac number, because 20548817 - 2² = 20548813 is a prime.

Together with 20548819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20548813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10274408 + 10274409.

It is an arithmetic number, because the mean of its divisors is an integer number (10274409).

Almost surely, 2^20548817 is an apocalyptic number.

It is an amenable number.

20548817 is a deficient number, since it is larger than the sum of its proper divisors (1).

20548817 is an equidigital number, since it uses as much as digits as its factorization.

20548817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 20548817 is about 4533.0802993108. The cubic root of 20548817 is about 273.9022552592.

The spelling of 20548817 in words is "twenty million, five hundred forty-eight thousand, eight hundred seventeen".