920905 has 4 divisors (see below), whose sum is σ = 1105092. Its totient is φ = 736720.

The previous prime is 920891. The next prime is 920921. The reversal of 920905 is 509029.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 473344 + 447561 = 688^2 + 669^2 .

It is not a de Polignac number, because 920905 - 2⁹ = 920393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 920905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92086 + ... + 92095.

It is an arithmetic number, because the mean of its divisors is an integer number (276273).

2⁹²⁰⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

920905 is a deficient number, since it is larger than the sum of its proper divisors (184187).

920905 is a wasteful number, since it uses less digits than its factorization.

920905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184186.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 920905 is about 959.6379525634. The cubic root of 920905 is about 97.2907632172.

The spelling of 920905 in words is "nine hundred twenty thousand, nine hundred five".