820188044 has 24 divisors (see below), whose sum is σ = 1563115680. Its totient is φ = 374292864.

The previous prime is 820188043. The next prime is 820188077. The reversal of 820188044 is 440881028.

It is a junction number, because it is equal to n+sod(n) for n = 820187995 and 820188013.

It is not an unprimeable number, because it can be changed into a prime (820188043) 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 7 ways as a sum of consecutive naturals, for example, 83984 + ... + 93239.

It is an arithmetic number, because the mean of its divisors is an integer number (65129820).

Almost surely, 2^820188044 is an apocalyptic number.

It is an amenable number.

820188044 is a deficient number, since it is larger than the sum of its proper divisors (742927636).

820188044 is a wasteful number, since it uses less digits than its factorization.

820188044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177329 (or 177327 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 35.

The square root of 820188044 is about 28638.9253289993. The cubic root of 820188044 is about 936.0617045424.

The spelling of 820188044 in words is "eight hundred twenty million, one hundred eighty-eight thousand, forty-four".