20804180 has 24 divisors (see below), whose sum is σ = 43781472. Its totient is φ = 8304032.

The previous prime is 20804159. The next prime is 20804257. The reversal of 20804180 is 8140802.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 12899 + ... + 14421.

It is an arithmetic number, because the mean of its divisors is an integer number (1824228).

Almost surely, 2^20804180 is an apocalyptic number.

20804180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20804180 is an abundant number, since it is smaller than the sum of its proper divisors (22977292).

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

20804180 is a wasteful number, since it uses less digits than its factorization.

20804180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215 (or 2213 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 20804180 is about 4561.1599401907. The cubic root of 20804180 is about 275.0321945779.

Adding to 20804180 its reverse (8140802), we get a palindrome (28944982).

The spelling of 20804180 in words is "twenty million, eight hundred four thousand, one hundred eighty".