20187804 has 144 divisors (see below), whose sum is σ = 62563200. Its totient is φ = 5007744.

The previous prime is 20187803. The next prime is 20187809. The reversal of 20187804 is 40878102.

It is a super-3 number, since 3×20187804³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20187803) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 145167 + ... + 145305.

Almost surely, 2^20187804 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20187804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31281600).

20187804 is an abundant number, since it is smaller than the sum of its proper divisors (42375396).

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

20187804 is a wasteful number, since it uses less digits than its factorization.

20187804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 20187804 is about 4493.0840188004. The cubic root of 20187804 is about 272.2887468558.

The spelling of 20187804 in words is "twenty million, one hundred eighty-seven thousand, eight hundred four".