206556220 has 48 divisors (see below), whose sum is σ = 491732640. Its totient is φ = 72251136.

The previous prime is 206556197. The next prime is 206556221. The reversal of 206556220 is 22655602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206556221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15967 + ... + 25846.

It is an arithmetic number, because the mean of its divisors is an integer number (10244430).

Almost surely, 2^206556220 is an apocalyptic number.

206556220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206556220 is an abundant number, since it is smaller than the sum of its proper divisors (285176420).

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

206556220 is a wasteful number, since it uses less digits than its factorization.

206556220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41854 (or 41852 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 206556220 is about 14372.0638740579. The cubic root of 206556220 is about 591.1251344288.

It can be divided in two parts, 2065 and 56220, that added together give a palindrome (58285).

The spelling of 206556220 in words is "two hundred six million, five hundred fifty-six thousand, two hundred twenty".