820047111 has 16 divisors (see below), whose sum is σ = 1199723616. Its totient is φ = 495121536.

The previous prime is 820047101. The next prime is 820047127. The reversal of 820047111 is 111740028.

It is not a de Polignac number, because 820047111 - 2⁹ = 820046599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820047101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196300 + ... + 200433.

It is an arithmetic number, because the mean of its divisors is an integer number (74982726).

Almost surely, 2^820047111 is an apocalyptic number.

820047111 is a deficient number, since it is larger than the sum of its proper divisors (379676505).

820047111 is a wasteful number, since it uses less digits than its factorization.

820047111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396802.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 820047111 is about 28636.4647084796. The cubic root of 820047111 is about 936.0080869434.

Adding to 820047111 its reverse (111740028), we get a palindrome (931787139).

The spelling of 820047111 in words is "eight hundred twenty million, forty-seven thousand, one hundred eleven".