206820451 has 2 divisors, whose sum is σ = 206820452. Its totient is φ = 206820450.

The previous prime is 206820433. The next prime is 206820517. The reversal of 206820451 is 154028602.

206820451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206820451 - 2¹⁹ = 206296163 is a prime.

It is not a weakly prime, because it can be changed into another prime (206820401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103410225 + 103410226.

It is an arithmetic number, because the mean of its divisors is an integer number (103410226).

Almost surely, 2^206820451 is an apocalyptic number.

206820451 is a deficient number, since it is larger than the sum of its proper divisors (1).

206820451 is an equidigital number, since it uses as much as digits as its factorization.

206820451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 206820451 is about 14381.2534571921. The cubic root of 206820451 is about 591.3770868685.

The spelling of 206820451 in words is "two hundred six million, eight hundred twenty thousand, four hundred fifty-one".