206620401 has 16 divisors (see below), whose sum is σ = 297239040. Its totient is φ = 126913920.

The previous prime is 206620399. The next prime is 206620411. The reversal of 206620401 is 104026602.

It is a happy number.

It is not a de Polignac number, because 206620401 - 2¹ = 206620399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206620411) 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 15 ways as a sum of consecutive naturals, for example, 17536 + ... + 26846.

It is an arithmetic number, because the mean of its divisors is an integer number (18577440).

Almost surely, 2^206620401 is an apocalyptic number.

It is an amenable number.

206620401 is a deficient number, since it is larger than the sum of its proper divisors (90618639).

206620401 is a wasteful number, since it uses less digits than its factorization.

206620401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9896.

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

The square root of 206620401 is about 14374.2965393093. The cubic root of 206620401 is about 591.1863527474.

The spelling of 206620401 in words is "two hundred six million, six hundred twenty thousand, four hundred one".