206621040 has 40 divisors (see below), whose sum is σ = 640525968. Its totient is φ = 55098880.

The previous prime is 206621039. The next prime is 206621081. The reversal of 206621040 is 40126602.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 206620998 and 206621016.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 430221 + ... + 430700.

Almost surely, 2^206621040 is an apocalyptic number.

206621040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206621040 is an abundant number, since it is smaller than the sum of its proper divisors (433904928).

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

206621040 is a wasteful number, since it uses less digits than its factorization.

206621040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860937 (or 860931 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 206621040 is about 14374.3187664668. The cubic root of 206621040 is about 591.1869621866.

Adding to 206621040 its reverse (40126602), we get a palindrome (246747642).

The spelling of 206621040 in words is "two hundred six million, six hundred twenty-one thousand, forty".