20804151 has 4 divisors (see below), whose sum is σ = 27738872. Its totient is φ = 13869432.

The previous prime is 20804149. The next prime is 20804159. The reversal of 20804151 is 15140802.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20804151 - 2¹ = 20804149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20804159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3467356 + ... + 3467361.

It is an arithmetic number, because the mean of its divisors is an integer number (6934718).

Almost surely, 2^20804151 is an apocalyptic number.

20804151 is a deficient number, since it is larger than the sum of its proper divisors (6934721).

20804151 is an equidigital number, since it uses as much as digits as its factorization.

20804151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6934720.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 20804151 is about 4561.1567611736. The cubic root of 20804151 is about 275.0320667841.

Adding to 20804151 its reverse (15140802), we get a palindrome (35944953).

The spelling of 20804151 in words is "twenty million, eight hundred four thousand, one hundred fifty-one".