206894905 has 12 divisors (see below), whose sum is σ = 288808740. Its totient is φ = 141870624.

The previous prime is 206894873. The next prime is 206894911. The reversal of 206894905 is 509498602.

It can be written as a sum of positive squares in 2 ways, for example, as 44408896 + 162486009 = 6664^2 + 12747^2 .

It is not a de Polignac number, because 206894905 - 2⁵ = 206894873 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 421990 + ... + 422479.

It is an arithmetic number, because the mean of its divisors is an integer number (24067395).

Almost surely, 2^206894905 is an apocalyptic number.

It is an amenable number.

206894905 is a deficient number, since it is larger than the sum of its proper divisors (81913835).

206894905 is an equidigital number, since it uses as much as digits as its factorization.

206894905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844488 (or 844481 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 206894905 is about 14383.8418025227. The cubic root of 206894905 is about 591.4480423066.

The spelling of 206894905 in words is "two hundred six million, eight hundred ninety-four thousand, nine hundred five".