206221220 has 48 divisors (see below), whose sum is σ = 478493568. Its totient is φ = 74257920.

The previous prime is 206221201. The next prime is 206221229. The reversal of 206221220 is 22122602.

206221220 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 (17).

It is not an unprimeable number, because it can be changed into a prime (206221229) 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, 5366 + ... + 21005.

It is an arithmetic number, because the mean of its divisors is an integer number (9968616).

Almost surely, 2^206221220 is an apocalyptic number.

206221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206221220 is an abundant number, since it is smaller than the sum of its proper divisors (272272348).

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

206221220 is a wasteful number, since it uses less digits than its factorization.

206221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26420 (or 26418 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 206221220 is about 14360.4045904006. The cubic root of 206221220 is about 590.8053924683.

Adding to 206221220 its reverse (22122602), we get a palindrome (228343822).

The spelling of 206221220 in words is "two hundred six million, two hundred twenty-one thousand, two hundred twenty".