20158847 has 4 divisors (see below), whose sum is σ = 20176680. Its totient is φ = 20141016.

The previous prime is 20158843. The next prime is 20158871. The reversal of 20158847 is 74885102.

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

It is a cyclic number.

It is not a de Polignac number, because 20158847 - 2² = 20158843 is a prime.

It is a super-2 number, since 2×20158847² = 812758224738818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20158843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7097 + ... + 9522.

It is an arithmetic number, because the mean of its divisors is an integer number (5044170).

Almost surely, 2^20158847 is an apocalyptic number.

20158847 is a deficient number, since it is larger than the sum of its proper divisors (17833).

20158847 is a wasteful number, since it uses less digits than its factorization.

20158847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17832.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 20158847 is about 4489.8604655379. The cubic root of 20158847 is about 272.1584959690.

The spelling of 20158847 in words is "twenty million, one hundred fifty-eight thousand, eight hundred forty-seven".