206706621 has 32 divisors (see below), whose sum is σ = 319939200. Its totient is φ = 117319680.

The previous prime is 206706607. The next prime is 206706737. The reversal of 206706621 is 126607602.

It is not a de Polignac number, because 206706621 - 2¹⁸ = 206444477 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206716621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127665 + ... + 129273.

It is an arithmetic number, because the mean of its divisors is an integer number (9998100).

Almost surely, 2^206706621 is an apocalyptic number.

It is an amenable number.

206706621 is a deficient number, since it is larger than the sum of its proper divisors (113232579).

206706621 is a wasteful number, since it uses less digits than its factorization.

206706621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1869.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 206706621 is about 14377.2953297900. The cubic root of 206706621 is about 591.2685727650.

The spelling of 206706621 in words is "two hundred six million, seven hundred six thousand, six hundred twenty-one".