920665885 has 4 divisors (see below), whose sum is σ = 1104799068. Its totient is φ = 736532704.

The previous prime is 920665883. The next prime is 920665909. The reversal of 920665885 is 588566029.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 588566029 = 41 ⋅14355269.

It can be written as a sum of positive squares in 2 ways, for example, as 577008441 + 343657444 = 24021^2 + 18538^2 .

It is a cyclic number.

It is not a de Polignac number, because 920665885 - 2¹ = 920665883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920665883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92066584 + ... + 92066593.

It is an arithmetic number, because the mean of its divisors is an integer number (276199767).

Almost surely, 2^920665885 is an apocalyptic number.

It is an amenable number.

920665885 is a deficient number, since it is larger than the sum of its proper divisors (184133183).

920665885 is a wasteful number, since it uses less digits than its factorization.

920665885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184133182.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The square root of 920665885 is about 30342.4765798707. The cubic root of 920665885 is about 972.8234190173.

The spelling of 920665885 in words is "nine hundred twenty million, six hundred sixty-five thousand, eight hundred eighty-five".