206436140 has 24 divisors (see below), whose sum is σ = 456333360. Its totient is φ = 78228288.

The previous prime is 206436137. The next prime is 206436143. The reversal of 206436140 is 41634602.

It is an interprime number because it is at equal distance from previous prime (206436137) and next prime (206436143).

It is not an unprimeable number, because it can be changed into a prime (206436143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271247 + ... + 272006.

It is an arithmetic number, because the mean of its divisors is an integer number (19013890).

Almost surely, 2^206436140 is an apocalyptic number.

206436140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206436140 is an abundant number, since it is smaller than the sum of its proper divisors (249897220).

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

206436140 is a wasteful number, since it uses less digits than its factorization.

206436140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543281 (or 543279 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 206436140 is about 14367.8857178083. The cubic root of 206436140 is about 591.0105634166.

The spelling of 206436140 in words is "two hundred six million, four hundred thirty-six thousand, one hundred forty".