120920805 has 12 divisors (see below), whose sum is σ = 209596140. Its totient is φ = 64491072.

The previous prime is 120920783. The next prime is 120920809. The reversal of 120920805 is 508029021.

It can be written as a sum of positive squares in 2 ways, for example, as 83942244 + 36978561 = 9162^2 + 6081^2 .

It is not a de Polignac number, because 120920805 - 2⁶ = 120920741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120920809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1343520 + ... + 1343609.

It is an arithmetic number, because the mean of its divisors is an integer number (17466345).

Almost surely, 2^120920805 is an apocalyptic number.

120920805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

120920805 is a deficient number, since it is larger than the sum of its proper divisors (88675335).

120920805 is a wasteful number, since it uses less digits than its factorization.

120920805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2687140 (or 2687137 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 120920805 is about 10996.3996380634. The cubic root of 120920805 is about 494.5008129519.

Adding to 120920805 its reverse (508029021), we get a palindrome (628949826).

The spelling of 120920805 in words is "one hundred twenty million, nine hundred twenty thousand, eight hundred five".