206243640 has 96 divisors (see below), whose sum is σ = 679816800. Its totient is φ = 54216960.

The previous prime is 206243633. The next prime is 206243647. The reversal of 206243640 is 46342602.

206243640 is a `hidden beast` number, since 2 + 0 + 624 + 36 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (206243633) and next prime (206243647).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206243647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21526 + ... + 29594.

It is an arithmetic number, because the mean of its divisors is an integer number (7081425).

Almost surely, 2^206243640 is an apocalyptic number.

206243640 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 206243640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (339908400).

206243640 is an abundant number, since it is smaller than the sum of its proper divisors (473573160).

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

206243640 is a wasteful number, since it uses less digits than its factorization.

206243640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8157 (or 8150 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 206243640 is about 14361.1851878597. The cubic root of 206243640 is about 590.8268021255.

The spelling of 206243640 in words is "two hundred six million, two hundred forty-three thousand, six hundred forty".