20158788 has 24 divisors (see below), whose sum is σ = 50655808. Its totient is φ = 6202656.

The previous prime is 20158783. The next prime is 20158807. The reversal of 20158788 is 88785102.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (20158781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64456 + ... + 64767.

Almost surely, 2^20158788 is an apocalyptic number.

It is an amenable number.

20158788 is an abundant number, since it is smaller than the sum of its proper divisors (30497020).

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

20158788 is a wasteful number, since it uses less digits than its factorization.

20158788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129243 (or 129241 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 20158788 is about 4489.8538951730. The cubic root of 20158788 is about 272.1582304550.

The spelling of 20158788 in words is "twenty million, one hundred fifty-eight thousand, seven hundred eighty-eight".