206342218 has 4 divisors (see below), whose sum is σ = 309513330. Its totient is φ = 103171108.

The previous prime is 206342207. The next prime is 206342239. The reversal of 206342218 is 812243602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 812243602 = 2 ⋅406121801.

It can be written as a sum of positive squares in only one way, i.e., 201157489 + 5184729 = 14183^2 + 2277^2 .

It is a super-2 number, since 2×206342218² = 85154221858319048, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51585553 + ... + 51585556.

Almost surely, 2^206342218 is an apocalyptic number.

206342218 is a deficient number, since it is larger than the sum of its proper divisors (103171112).

206342218 is a wasteful number, since it uses less digits than its factorization.

206342218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103171111.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 206342218 is about 14364.6168761997. The cubic root of 206342218 is about 590.9209193673.

The spelling of 206342218 in words is "two hundred six million, three hundred forty-two thousand, two hundred eighteen".