20558249 has 4 divisors (see below), whose sum is σ = 20818560. Its totient is φ = 20297940.

The previous prime is 20558243. The next prime is 20558267. The reversal of 20558249 is 94285502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20558249 - 2⁴ = 20558233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20558243) 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, 130037 + ... + 130194.

It is an arithmetic number, because the mean of its divisors is an integer number (5204640).

Almost surely, 2^20558249 is an apocalyptic number.

It is an amenable number.

20558249 is a deficient number, since it is larger than the sum of its proper divisors (260311).

20558249 is an equidigital number, since it uses as much as digits as its factorization.

20558249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260310.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 20558249 is about 4534.1205321429. The cubic root of 20558249 is about 273.9441563072.

The spelling of 20558249 in words is "twenty million, five hundred fifty-eight thousand, two hundred forty-nine".