20808047 has 8 divisors (see below), whose sum is σ = 22693440. Its totient is φ = 18963360.

The previous prime is 20808019. The next prime is 20808071. The reversal of 20808047 is 74080802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20808047 - 2⁸ = 20807791 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 (20808247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9104 + ... + 11157.

It is an arithmetic number, because the mean of its divisors is an integer number (2836680).

Almost surely, 2^20808047 is an apocalyptic number.

20808047 is a deficient number, since it is larger than the sum of its proper divisors (1885393).

20808047 is a wasteful number, since it uses less digits than its factorization.

20808047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20353.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 20808047 is about 4561.5838258219. The cubic root of 20808047 is about 275.0492341601.

Adding to 20808047 its reverse (74080802), we get a palindrome (94888849).

The spelling of 20808047 in words is "twenty million, eight hundred eight thousand, forty-seven".