206356220 has 24 divisors (see below), whose sum is σ = 495255264. Its totient is φ = 70750656.

The previous prime is 206356219. The next prime is 206356237. The reversal of 206356220 is 22653602.

It is a self number, because there is not a number n which added to its sum of digits gives 206356220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736847 + ... + 737126.

It is an arithmetic number, because the mean of its divisors is an integer number (20635636).

Almost surely, 2^206356220 is an apocalyptic number.

206356220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206356220 is an abundant number, since it is smaller than the sum of its proper divisors (288899044).

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

206356220 is a wasteful number, since it uses less digits than its factorization.

206356220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473989 (or 1473987 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 206356220 is about 14365.1042460540. The cubic root of 206356220 is about 590.9342853307.

The spelling of 206356220 in words is "two hundred six million, three hundred fifty-six thousand, two hundred twenty".