206621417 has 12 divisors (see below), whose sum is σ = 226580736. Its totient is φ = 188185920.

The previous prime is 206621411. The next prime is 206621423. The reversal of 206621417 is 714126602.

It is an interprime number because it is at equal distance from previous prime (206621411) and next prime (206621423).

It is not a de Polignac number, because 206621417 - 2⁸ = 206621161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206621417.

It is not an unprimeable number, because it can be changed into a prime (206621411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2573 + ... + 20490.

It is an arithmetic number, because the mean of its divisors is an integer number (18881728).

Almost surely, 2^206621417 is an apocalyptic number.

It is an amenable number.

206621417 is a deficient number, since it is larger than the sum of its proper divisors (19959319).

206621417 is a wasteful number, since it uses less digits than its factorization.

206621417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23128 (or 23111 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 206621417 is about 14374.3318801258. The cubic root of 206621417 is about 591.1873217456.

The spelling of 206621417 in words is "two hundred six million, six hundred twenty-one thousand, four hundred seventeen".