20158956 has 30 divisors (see below), whose sum is σ = 52700340. Its totient is φ = 6719544.

The previous prime is 20158937. The next prime is 20158961. The reversal of 20158956 is 65985102.

It is a happy number.

20158956 is a `hidden beast` number, since 20 + 1 + 589 + 56 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20158956.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 30786 + ... + 31433.

It is an arithmetic number, because the mean of its divisors is an integer number (1756678).

Almost surely, 2^20158956 is an apocalyptic number.

It is an amenable number.

20158956 is an abundant number, since it is smaller than the sum of its proper divisors (32541384).

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

20158956 is a wasteful number, since it uses less digits than its factorization.

20158956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62235 (or 62224 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 20158956 is about 4489.8726039833. The cubic root of 20158956 is about 272.1589864934.

The spelling of 20158956 in words is "twenty million, one hundred fifty-eight thousand, nine hundred fifty-six".