120820566 has 16 divisors (see below), whose sum is σ = 242362224. Its totient is φ = 40153344.

The previous prime is 120820537. The next prime is 120820571. The reversal of 120820566 is 665028021.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27855 + ... + 31898.

It is an arithmetic number, because the mean of its divisors is an integer number (15147639).

Almost surely, 2^120820566 is an apocalyptic number.

120820566 is an abundant number, since it is smaller than the sum of its proper divisors (121541658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

120820566 is a wasteful number, since it uses less digits than its factorization.

120820566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60095.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 120820566 is about 10991.8408831278. The cubic root of 120820566 is about 494.3641340458.

Adding to 120820566 its reverse (665028021), we get a palindrome (785848587).

The spelling of 120820566 in words is "one hundred twenty million, eight hundred twenty thousand, five hundred sixty-six".