20181358 has 4 divisors (see below), whose sum is σ = 30272040. Its totient is φ = 10090678.

The previous prime is 20181353. The next prime is 20181437. The reversal of 20181358 is 85318102.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20181353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5045338 + ... + 5045341.

It is an arithmetic number, because the mean of its divisors is an integer number (7568010).

Almost surely, 2^20181358 is an apocalyptic number.

20181358 is a deficient number, since it is larger than the sum of its proper divisors (10090682).

20181358 is a wasteful number, since it uses less digits than its factorization.

20181358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10090681.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 20181358 is about 4492.3666368630. The cubic root of 20181358 is about 272.2597630181.

The spelling of 20181358 in words is "twenty million, one hundred eighty-one thousand, three hundred fifty-eight".