206245780 has 24 divisors (see below), whose sum is σ = 466433352. Its totient is φ = 76152192.

The previous prime is 206245777. The next prime is 206245847. The reversal of 206245780 is 87542602.

It can be written as a sum of positive squares in 4 ways, for example, as 2669956 + 203575824 = 1634^2 + 14268^2 .

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 396367 + ... + 396886.

It is an arithmetic number, because the mean of its divisors is an integer number (19434723).

Almost surely, 2^206245780 is an apocalyptic number.

206245780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206245780 is an abundant number, since it is smaller than the sum of its proper divisors (260187572).

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

206245780 is a wasteful number, since it uses less digits than its factorization.

206245780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793275 (or 793273 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 206245780 is about 14361.2596940519. The cubic root of 206245780 is about 590.8288456067.

It can be divided in two parts, 206245 and 780, that added together give a square (207025 = 455²).

The spelling of 206245780 in words is "two hundred six million, two hundred forty-five thousand, seven hundred eighty".