20158855 has 8 divisors (see below), whose sum is σ = 25613712. Its totient is φ = 15178368.

The previous prime is 20158843. The next prime is 20158871. The reversal of 20158855 is 55885102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20158855 - 2¹⁷ = 20027783 is a prime.

It is a super-2 number, since 2×20158855² = 812758869822050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20158855.

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 7 ways as a sum of consecutive naturals, for example, 118497 + ... + 118666.

It is an arithmetic number, because the mean of its divisors is an integer number (3201714).

Almost surely, 2^20158855 is an apocalyptic number.

20158855 is a deficient number, since it is larger than the sum of its proper divisors (5454857).

20158855 is a wasteful number, since it uses less digits than its factorization.

20158855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237185.

The product of its (nonzero) digits is 16000, while the sum is 34.

The square root of 20158855 is about 4489.8613564341. The cubic root of 20158855 is about 272.1585319708.

The spelling of 20158855 in words is "twenty million, one hundred fifty-eight thousand, eight hundred fifty-five".