20558234 has 4 divisors (see below), whose sum is σ = 30837354. Its totient is φ = 10279116.

The previous prime is 20558233. The next prime is 20558243. The reversal of 20558234 is 43285502.

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

It can be written as a sum of positive squares in only one way, i.e., 18447025 + 2111209 = 4295^2 + 1453^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20558197 and 20558206.

It is not an unprimeable number, because it can be changed into a prime (20558233) 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 as a sum of consecutive naturals, namely, 5139557 + ... + 5139560.

Almost surely, 2^20558234 is an apocalyptic number.

20558234 is a deficient number, since it is larger than the sum of its proper divisors (10279120).

20558234 is a wasteful number, since it uses less digits than its factorization.

20558234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10279119.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 20558234 is about 4534.1188780181. The cubic root of 20558234 is about 273.9440896808.

The spelling of 20558234 in words is "twenty million, five hundred fifty-eight thousand, two hundred thirty-four".