20644201 has 8 divisors (see below), whose sum is σ = 21628800. Its totient is φ = 19677840.

The previous prime is 20644199. The next prime is 20644213. The reversal of 20644201 is 10244602.

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

It is a cyclic number.

It is not a de Polignac number, because 20644201 - 2¹ = 20644199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20645201) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2215 + ... + 6796.

It is an arithmetic number, because the mean of its divisors is an integer number (2703600).

Almost surely, 2^20644201 is an apocalyptic number.

It is an amenable number.

20644201 is a deficient number, since it is larger than the sum of its proper divisors (984599).

20644201 is an equidigital number, since it uses as much as digits as its factorization.

20644201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9119.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 20644201 is about 4543.5889998986. The cubic root of 20644201 is about 274.3254032633.

Adding to 20644201 its reverse (10244602), we get a palindrome (30888803).

The spelling of 20644201 in words is "twenty million, six hundred forty-four thousand, two hundred one".