205906813 has 8 divisors (see below), whose sum is σ = 241682432. Its totient is φ = 171721296.

The previous prime is 205906783. The next prime is 205906823. The reversal of 205906813 is 318609502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205906813 - 2⁹ = 205906301 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 (205906823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397245 + ... + 397762.

It is an arithmetic number, because the mean of its divisors is an integer number (30210304).

Almost surely, 2^205906813 is an apocalyptic number.

It is an amenable number.

205906813 is a deficient number, since it is larger than the sum of its proper divisors (35775619).

205906813 is an equidigital number, since it uses as much as digits as its factorization.

205906813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795051.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 205906813 is about 14349.4534042241. The cubic root of 205906813 is about 590.5049904186.

The spelling of 205906813 in words is "two hundred five million, nine hundred six thousand, eight hundred thirteen".