20000178 has 48 divisors (see below), whose sum is σ = 47882016. Its totient is φ = 5982720.

The previous prime is 20000171. The next prime is 20000213. The reversal of 20000178 is 87100002.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 20000178.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000171) 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, 15826 + ... + 17042.

It is an arithmetic number, because the mean of its divisors is an integer number (997542).

Almost surely, 2^20000178 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20000178, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23941008).

20000178 is an abundant number, since it is smaller than the sum of its proper divisors (27881838).

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

20000178 is a wasteful number, since it uses less digits than its factorization.

20000178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319 (or 1316 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 20000178 is about 4472.1558559603. The cubic root of 20000178 is about 271.4425669343.

The spelling of 20000178 in words is "twenty million, one hundred seventy-eight", and thus it is an aban number.