20558105 has 4 divisors (see below), whose sum is σ = 24669732. Its totient is φ = 16446480.

The previous prime is 20558089. The next prime is 20558119. The reversal of 20558105 is 50185502.

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 12645136 + 7912969 = 3556^2 + 2813^2 .

It is not a de Polignac number, because 20558105 - 2⁴ = 20558089 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2055806 + ... + 2055815.

It is an arithmetic number, because the mean of its divisors is an integer number (6167433).

Almost surely, 2^20558105 is an apocalyptic number.

It is an amenable number.

20558105 is a deficient number, since it is larger than the sum of its proper divisors (4111627).

20558105 is an equidigital number, since it uses as much as digits as its factorization.

20558105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4111626.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 20558105 is about 4534.1046525196. The cubic root of 20558105 is about 273.9435166929.

The spelling of 20558105 in words is "twenty million, five hundred fifty-eight thousand, one hundred five".