20158943 has 24 divisors (see below), whose sum is σ = 25171200. Its totient is φ = 16048368.

The previous prime is 20158937. The next prime is 20158961. The reversal of 20158943 is 34985102.

It is not a de Polignac number, because 20158943 - 2¹² = 20154847 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20158993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54746 + ... + 55112.

It is an arithmetic number, because the mean of its divisors is an integer number (1048800).

Almost surely, 2^20158943 is an apocalyptic number.

20158943 is a deficient number, since it is larger than the sum of its proper divisors (5012257).

20158943 is a wasteful number, since it uses less digits than its factorization.

20158943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459 (or 452 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20158943 is about 4489.8711562805. The cubic root of 20158943 is about 272.1589279906.

The spelling of 20158943 in words is "twenty million, one hundred fifty-eight thousand, nine hundred forty-three".