206820461 has 4 divisors (see below), whose sum is σ = 209653692. Its totient is φ = 203987232.

The previous prime is 206820451. The next prime is 206820517. The reversal of 206820461 is 164028602.

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 173976100 + 32844361 = 13190^2 + 5731^2 .

It is a cyclic number.

It is not a de Polignac number, because 206820461 - 2¹⁴ = 206804077 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 (206820401) 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, 1416506 + ... + 1416651.

It is an arithmetic number, because the mean of its divisors is an integer number (52413423).

Almost surely, 2^206820461 is an apocalyptic number.

It is an amenable number.

206820461 is a deficient number, since it is larger than the sum of its proper divisors (2833231).

206820461 is an equidigital number, since it uses as much as digits as its factorization.

206820461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2833230.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 206820461 is about 14381.2538048669. The cubic root of 206820461 is about 591.3770963997.

The spelling of 206820461 in words is "two hundred six million, eight hundred twenty thousand, four hundred sixty-one".