206427145 has 4 divisors (see below), whose sum is σ = 247712580. Its totient is φ = 165141712.

The previous prime is 206427119. The next prime is 206427163. The reversal of 206427145 is 541724602.

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 26759929 + 179667216 = 5173^2 + 13404^2 .

It is a cyclic number.

It is not a de Polignac number, because 206427145 - 2⁵ = 206427113 is a prime.

It is a super-2 number, since 2×206427145² = 85224332385702050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20642710 + ... + 20642719.

It is an arithmetic number, because the mean of its divisors is an integer number (61928145).

Almost surely, 2^206427145 is an apocalyptic number.

It is an amenable number.

206427145 is a deficient number, since it is larger than the sum of its proper divisors (41285435).

206427145 is an equidigital number, since it uses as much as digits as its factorization.

206427145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41285434.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 206427145 is about 14367.5726899153. The cubic root of 206427145 is about 591.0019792975.

The spelling of 206427145 in words is "two hundred six million, four hundred twenty-seven thousand, one hundred forty-five".