206201640 has 64 divisors (see below), whose sum is σ = 627105600. Its totient is φ = 54231552.

The previous prime is 206201591. The next prime is 206201651. The reversal of 206201640 is 46102602.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3010 + ... + 20529.

It is an arithmetic number, because the mean of its divisors is an integer number (9798525).

Almost surely, 2^206201640 is an apocalyptic number.

206201640 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 206201640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (313552800).

206201640 is an abundant number, since it is smaller than the sum of its proper divisors (420903960).

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

206201640 is a wasteful number, since it uses less digits than its factorization.

206201640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23626 (or 23622 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 206201640 is about 14359.7228385509. The cubic root of 206201640 is about 590.7866935589.

The spelling of 206201640 in words is "two hundred six million, two hundred one thousand, six hundred forty".