206370057 has 4 divisors (see below), whose sum is σ = 275160080. Its totient is φ = 137580036.

The previous prime is 206370049. The next prime is 206370067. The reversal of 206370057 is 750073602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 206370057 - 2³ = 206370049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206370067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34395007 + ... + 34395012.

It is an arithmetic number, because the mean of its divisors is an integer number (68790020).

Almost surely, 2^206370057 is an apocalyptic number.

It is an amenable number.

206370057 is a deficient number, since it is larger than the sum of its proper divisors (68790023).

206370057 is an equidigital number, since it uses as much as digits as its factorization.

206370057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68790022.

The product of its (nonzero) digits is 8820, while the sum is 30.

The square root of 206370057 is about 14365.5858564835. The cubic root of 206370057 is about 590.9474931951.

The spelling of 206370057 in words is "two hundred six million, three hundred seventy thousand, fifty-seven".