20008047 has 4 divisors (see below), whose sum is σ = 26677400. Its totient is φ = 13338696.

The previous prime is 20008039. The next prime is 20008049. The reversal of 20008047 is 74080002.

It is a happy number.

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

It is not a de Polignac number, because 20008047 - 2³ = 20008039 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 (20008049) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3334672 + ... + 3334677.

It is an arithmetic number, because the mean of its divisors is an integer number (6669350).

Almost surely, 2^20008047 is an apocalyptic number.

20008047 is a deficient number, since it is larger than the sum of its proper divisors (6669353).

20008047 is an equidigital number, since it uses as much as digits as its factorization.

20008047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6669352.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 20008047 is about 4473.0355464718. The cubic root of 20008047 is about 271.4781616424.

Adding to 20008047 its reverse (74080002), we get a palindrome (94088049).

The spelling of 20008047 in words is "twenty million, eight thousand, forty-seven".