201020644 has 24 divisors (see below), whose sum is σ = 400454208. Its totient is φ = 87399840.

The previous prime is 201020641. The next prime is 201020669. The reversal of 201020644 is 446020102.

It is not an unprimeable number, because it can be changed into a prime (201020641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98307 + ... + 100330.

It is an arithmetic number, because the mean of its divisors is an integer number (16685592).

Almost surely, 2^201020644 is an apocalyptic number.

It is an amenable number.

201020644 is a deficient number, since it is larger than the sum of its proper divisors (199433564).

201020644 is a wasteful number, since it uses less digits than its factorization.

201020644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198675 (or 198673 counting only the distinct ones).

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

The square root of 201020644 is about 14178.1749178094. The cubic root of 201020644 is about 585.7966539270.

Adding to 201020644 its reverse (446020102), we get a palindrome (647040746).

The spelling of 201020644 in words is "two hundred one million, twenty thousand, six hundred forty-four".