20548513 has 2 divisors, whose sum is σ = 20548514. Its totient is φ = 20548512.

The previous prime is 20548511. The next prime is 20548523. The reversal of 20548513 is 31584502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17040384 + 3508129 = 4128^2 + 1873^2 .

It is a cyclic number.

It is not a de Polignac number, because 20548513 - 2¹ = 20548511 is a prime.

It is a super-2 number, since 2×20548513² = 844482773022338, which contains 22 as substring.

Together with 20548511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20548511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10274256 + 10274257.

It is an arithmetic number, because the mean of its divisors is an integer number (10274257).

Almost surely, 2^20548513 is an apocalyptic number.

It is an amenable number.

20548513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20548513 is an equidigital number, since it uses as much as digits as its factorization.

20548513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 20548513 is about 4533.0467679035. The cubic root of 20548513 is about 273.9009045457.

The spelling of 20548513 in words is "twenty million, five hundred forty-eight thousand, five hundred thirteen".