20725185 has 32 divisors (see below), whose sum is σ = 37271808. Its totient is φ = 9757440.

The previous prime is 20725171. The next prime is 20725241. The reversal of 20725185 is 58152702.

It is not a de Polignac number, because 20725185 - 2⁵ = 20725153 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2175 + ... + 6795.

It is an arithmetic number, because the mean of its divisors is an integer number (1164744).

Almost surely, 2^20725185 is an apocalyptic number.

It is an amenable number.

20725185 is a deficient number, since it is larger than the sum of its proper divisors (16546623).

20725185 is a wasteful number, since it uses less digits than its factorization.

20725185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4665.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 20725185 is about 4552.4921746226. The cubic root of 20725185 is about 274.6836472349.

Adding to 20725185 its reverse (58152702), we get a palindrome (78877887).

It can be divided in two parts, 20725 and 185, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 20725185 in words is "twenty million, seven hundred twenty-five thousand, one hundred eighty-five".