206542404 has 36 divisors (see below), whose sum is σ = 529251996. Its totient is φ = 67903488.

The previous prime is 206542387. The next prime is 206542411. The reversal of 206542404 is 404245602.

206542404 is a `hidden beast` number, since 2 + 0 + 654 + 2 + 4 + 0 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 106502400 + 100040004 = 10320^2 + 10002^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36669 + ... + 41924.

Almost surely, 2^206542404 is an apocalyptic number.

It is an amenable number.

206542404 is an abundant number, since it is smaller than the sum of its proper divisors (322709592).

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

206542404 is a wasteful number, since it uses less digits than its factorization.

206542404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78676 (or 78671 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 206542404 is about 14371.5832113237. The cubic root of 206542404 is about 591.1119545353. Note that the first 3 decimals are identical.

The spelling of 206542404 in words is "two hundred six million, five hundred forty-two thousand, four hundred four".