206640020240 has 40 divisors (see below), whose sum is σ = 482927399448. Its totient is φ = 82227732480.

The previous prime is 206640020201. The next prime is 206640020299. The reversal of 206640020240 is 42020046602.

It can be written as a sum of positive squares in 4 ways, for example, as 17839342096 + 188800678144 = 133564^2 + 434512^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6676271 + ... + 6707150.

Almost surely, 2^206640020240 is an apocalyptic number.

206640020240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206640020240 is an abundant number, since it is smaller than the sum of its proper divisors (276287379208).

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

206640020240 is a wasteful number, since it uses less digits than its factorization.

206640020240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13383627 (or 13383621 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 206640020240 its reverse (42020046602), we get a palindrome (248660066842).

The spelling of 206640020240 in words is "two hundred six billion, six hundred forty million, twenty thousand, two hundred forty".