206261840 has 20 divisors (see below), whose sum is σ = 479558964. Its totient is φ = 82504704.

The previous prime is 206261837. The next prime is 206261851. The reversal of 206261840 is 48162602.

It can be written as a sum of positive squares in 2 ways, for example, as 116467264 + 89794576 = 10792^2 + 9476^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1289057 + ... + 1289216.

Almost surely, 2^206261840 is an apocalyptic number.

206261840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206261840 is an abundant number, since it is smaller than the sum of its proper divisors (273297124).

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

206261840 is a wasteful number, since it uses less digits than its factorization.

206261840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2578286 (or 2578280 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 206261840 is about 14361.8188263186. The cubic root of 206261840 is about 590.8441808134.

The spelling of 206261840 in words is "two hundred six million, two hundred sixty-one thousand, eight hundred forty".