206874820 has 12 divisors (see below), whose sum is σ = 434437164. Its totient is φ = 82749920.

The previous prime is 206874803. The next prime is 206874821. The reversal of 206874820 is 28478602.

It can be written as a sum of positive squares in 2 ways, for example, as 87759424 + 119115396 = 9368^2 + 10914^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 206874820.

It is not an unprimeable number, because it can be changed into a prime (206874821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5171851 + ... + 5171890.

It is an arithmetic number, because the mean of its divisors is an integer number (36203097).

Almost surely, 2^206874820 is an apocalyptic number.

206874820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206874820 is an abundant number, since it is smaller than the sum of its proper divisors (227562344).

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

206874820 is a wasteful number, since it uses less digits than its factorization.

206874820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10343750 (or 10343748 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 206874820 is about 14383.1436063192. The cubic root of 206874820 is about 591.4289027691.

The spelling of 206874820 in words is "two hundred six million, eight hundred seventy-four thousand, eight hundred twenty".