206308290 has 16 divisors (see below), whose sum is σ = 495139968. Its totient is φ = 55015536.

The previous prime is 206308273. The next prime is 206308313. The reversal of 206308290 is 92803602.

It is a super-2 number, since 2×206308290² = 85126221045448200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 6876943 = 206308290 / (2 + 0 + 6 + 3 + 0 + 8 + 2 + 9 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3438442 + ... + 3438501.

It is an arithmetic number, because the mean of its divisors is an integer number (30946248).

Almost surely, 2^206308290 is an apocalyptic number.

206308290 is an abundant number, since it is smaller than the sum of its proper divisors (288831678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206308290 is a wasteful number, since it uses less digits than its factorization.

206308290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6876953.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 206308290 is about 14363.4358702923. The cubic root of 206308290 is about 590.8885300287. Note that the first 3 decimals are identical.

It can be divided in two parts, 20630 and 8290, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 206308290 in words is "two hundred six million, three hundred eight thousand, two hundred ninety".