206255720 has 128 divisors (see below), whose sum is σ = 536544000. Its totient is φ = 70625280.

The previous prime is 206255719. The next prime is 206255737. The reversal of 206255720 is 27552602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 900566 + ... + 900794.

It is an arithmetic number, because the mean of its divisors is an integer number (4191750).

Almost surely, 2^206255720 is an apocalyptic number.

206255720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206255720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268272000).

206255720 is an abundant number, since it is smaller than the sum of its proper divisors (330288280).

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

206255720 is a wasteful number, since it uses less digits than its factorization.

206255720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 206255720 is about 14361.6057598028. The cubic root of 206255720 is about 590.8383371050.

The spelling of 206255720 in words is "two hundred six million, two hundred fifty-five thousand, seven hundred twenty".