820445605 has 16 divisors (see below), whose sum is σ = 1131477120. Its totient is φ = 559444032.

The previous prime is 820445579. The next prime is 820445609. The reversal of 820445605 is 506544028.

It is not a de Polignac number, because 820445605 - 2⁷ = 820445477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820445609) 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 15 ways as a sum of consecutive naturals, for example, 59214 + ... + 71743.

It is an arithmetic number, because the mean of its divisors is an integer number (70717320).

Almost surely, 2^820445605 is an apocalyptic number.

It is an amenable number.

820445605 is a deficient number, since it is larger than the sum of its proper divisors (311031515).

820445605 is a wasteful number, since it uses less digits than its factorization.

820445605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131148.

The product of its (nonzero) digits is 38400, while the sum is 34.

The square root of 820445605 is about 28643.4216706035. The cubic root of 820445605 is about 936.1596770982.

The spelling of 820445605 in words is "eight hundred twenty million, four hundred forty-five thousand, six hundred five".