20158236 has 72 divisors (see below), whose sum is σ = 58705920. Its totient is φ = 5713056.

The previous prime is 20158211. The next prime is 20158247. The reversal of 20158236 is 63285102.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 41845 + ... + 42323.

It is an arithmetic number, because the mean of its divisors is an integer number (815360).

Almost surely, 2^20158236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20158236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29352960).

20158236 is an abundant number, since it is smaller than the sum of its proper divisors (38547684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20158236 is a wasteful number, since it uses less digits than its factorization.

20158236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 20158236 is about 4489.7924228187. The cubic root of 20158236 is about 272.1557462991.

The spelling of 20158236 in words is "twenty million, one hundred fifty-eight thousand, two hundred thirty-six".