205642401 has 8 divisors (see below), whose sum is σ = 274260960. Its totient is φ = 137059392.

The previous prime is 205642369. The next prime is 205642439. The reversal of 205642401 is 104246502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 205642401 - 2⁵ = 205642369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205642501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10921 + ... + 23033.

It is an arithmetic number, because the mean of its divisors is an integer number (34282620).

Almost surely, 2^205642401 is an apocalyptic number.

It is an amenable number.

205642401 is a deficient number, since it is larger than the sum of its proper divisors (68618559).

205642401 is a wasteful number, since it uses less digits than its factorization.

205642401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17775.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 205642401 is about 14340.2371319306. The cubic root of 205642401 is about 590.2521195779.

Adding to 205642401 its reverse (104246502), we get a palindrome (309888903).

The spelling of 205642401 in words is "two hundred five million, six hundred forty-two thousand, four hundred one".