20012184 has 80 divisors (see below), whose sum is σ = 56845800. Its totient is φ = 6576768.

The previous prime is 20012171. The next prime is 20012189. The reversal of 20012184 is 48121002.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012189) 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 19 ways as a sum of consecutive naturals, for example, 57499 + ... + 57845.

Almost surely, 2^20012184 is an apocalyptic number.

20012184 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20012184, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28422900).

20012184 is an abundant number, since it is smaller than the sum of its proper divisors (36833616).

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

20012184 is a wasteful number, since it uses less digits than its factorization.

20012184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454 (or 441 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 20012184 is about 4473.4979602097. The cubic root of 20012184 is about 271.4968712438.

Adding to 20012184 its reverse (48121002), we get a palindrome (68133186).

The spelling of 20012184 in words is "twenty million, twelve thousand, one hundred eighty-four".