20138188 has 24 divisors (see below), whose sum is σ = 40680864. Its totient is φ = 8544000.

The previous prime is 20138171. The next prime is 20138191. The reversal of 20138188 is 88183102.

It is a plaindrome in base 16.

It is an unprimeable number.

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, 733 + ... + 6388.

It is an arithmetic number, because the mean of its divisors is an integer number (1695036).

Almost surely, 2^20138188 is an apocalyptic number.

20138188 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20138188 is an abundant number, since it is smaller than the sum of its proper divisors (20542676).

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

20138188 is a wasteful number, since it uses less digits than its factorization.

20138188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7233 (or 7231 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 20138188 is about 4487.5592475197. The cubic root of 20138188 is about 272.0654938884.

It can be divided in two parts, 2013 and 8188, that added together give a palindrome (10201).

The spelling of 20138188 in words is "twenty million, one hundred thirty-eight thousand, one hundred eighty-eight".