20188194 has 32 divisors (see below), whose sum is σ = 44205504. Its totient is φ = 6108480.

The previous prime is 20188169. The next prime is 20188219. The reversal of 20188194 is 49188102.

It is an interprime number because it is at equal distance from previous prime (20188169) and next prime (20188219).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2637 + ... + 6879.

It is an arithmetic number, because the mean of its divisors is an integer number (1381422).

Almost surely, 2^20188194 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20188194, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22102752).

20188194 is an abundant number, since it is smaller than the sum of its proper divisors (24017310).

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

20188194 is a wasteful number, since it uses less digits than its factorization.

20188194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4322.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 20188194 is about 4493.1274186250. The cubic root of 20188194 is about 272.2905002564.

The spelling of 20188194 in words is "twenty million, one hundred eighty-eight thousand, one hundred ninety-four".