206404040 has 16 divisors (see below), whose sum is σ = 464409180. Its totient is φ = 82561600.

The previous prime is 206404039. The next prime is 206404061. The reversal of 206404040 is 40404602.

206404040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 198190084 + 8213956 = 14078^2 + 2866^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 2580011 + ... + 2580090.

Almost surely, 2^206404040 is an apocalyptic number.

206404040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206404040 is an abundant number, since it is smaller than the sum of its proper divisors (258005140).

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

206404040 is a wasteful number, since it uses less digits than its factorization.

206404040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5160112 (or 5160108 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 206404040 is about 14366.7685997931. The cubic root of 206404040 is about 590.9799285635.

Adding to 206404040 its reverse (40404602), we get a palindrome (246808642).

The spelling of 206404040 in words is "two hundred six million, four hundred four thousand, forty".