206402004 has 72 divisors (see below), whose sum is σ = 536390400. Its totient is φ = 66889152.

The previous prime is 206401991. The next prime is 206402011. The reversal of 206402004 is 400204602.

206402004 is a `hidden beast` number, since 2 + 0 + 640 + 20 + 0 + 4 = 666.

206402004 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 336402 + ... + 337014.

Almost surely, 2^206402004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206402004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268195200).

206402004 is an abundant number, since it is smaller than the sum of its proper divisors (329988396).

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

206402004 is a wasteful number, since it uses less digits than its factorization.

206402004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869 (or 864 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 206402004 is about 14366.6977416524. The cubic root of 206402004 is about 590.9779853859.

Adding to 206402004 its reverse (400204602), we get a palindrome (606606606).

The spelling of 206402004 in words is "two hundred six million, four hundred two thousand, four".