20725184 has 28 divisors (see below), whose sum is σ = 41714928. Its totient is φ = 10214400.

The previous prime is 20725171. The next prime is 20725241. The reversal of 20725184 is 48152702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2264 + ... + 6824.

Almost surely, 2^20725184 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 20725184, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20857464).

20725184 is an abundant number, since it is smaller than the sum of its proper divisors (20989744).

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

20725184 is an equidigital number, since it uses as much as digits as its factorization.

20725184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4644 (or 4634 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 20725184 is about 4552.4920647926. The cubic root of 20725184 is about 274.6836428171.

Subtracting from 20725184 its product of nonzero digits (4480), we obtain a square (20720704 = 4552²).

Adding to 20725184 its reverse (48152702), we get a palindrome (68877886).

The spelling of 20725184 in words is "twenty million, seven hundred twenty-five thousand, one hundred eighty-four".