206788105 has 4 divisors (see below), whose sum is σ = 248145732. Its totient is φ = 165430480.

The previous prime is 206788103. The next prime is 206788159. The reversal of 206788105 is 501887602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 501887602 = 2 ⋅250943801.

It can be written as a sum of positive squares in 2 ways, for example, as 62283664 + 144504441 = 7892^2 + 12021^2 .

It is not a de Polignac number, because 206788105 - 2¹ = 206788103 is a prime.

It is a super-2 number, since 2×206788105² = 85522640738982050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206788103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20678806 + ... + 20678815.

It is an arithmetic number, because the mean of its divisors is an integer number (62036433).

Almost surely, 2^206788105 is an apocalyptic number.

It is an amenable number.

206788105 is a deficient number, since it is larger than the sum of its proper divisors (41357627).

206788105 is an equidigital number, since it uses as much as digits as its factorization.

206788105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41357626.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 206788105 is about 14380.1288241796. The cubic root of 206788105 is about 591.3462554872.

The spelling of 206788105 in words is "two hundred six million, seven hundred eighty-eight thousand, one hundred five".