20184240 has 80 divisors (see below), whose sum is σ = 64290528. Its totient is φ = 5234688.

The previous prime is 20184239. The next prime is 20184247. The reversal of 20184240 is 4248102.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (20184247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7744 + ... + 10016.

Almost surely, 2^20184240 is an apocalyptic number.

20184240 is a gapful number since it is divisible by the number (20) 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 20184240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32145264).

20184240 is an abundant number, since it is smaller than the sum of its proper divisors (44106288).

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

20184240 is a wasteful number, since it uses less digits than its factorization.

20184240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2326 (or 2320 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 20184240 is about 4492.6873917512. The cubic root of 20184240 is about 272.2727224249.

The spelling of 20184240 in words is "twenty million, one hundred eighty-four thousand, two hundred forty".