20201644 has 12 divisors (see below), whose sum is σ = 37432584. Its totient is φ = 9506624.

The previous prime is 20201563. The next prime is 20201651. The reversal of 20201644 is 44610202.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148474 + ... + 148609.

It is an arithmetic number, because the mean of its divisors is an integer number (3119382).

Almost surely, 2^20201644 is an apocalyptic number.

It is an amenable number.

20201644 is a deficient number, since it is larger than the sum of its proper divisors (17230940).

20201644 is a wasteful number, since it uses less digits than its factorization.

20201644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297104 (or 297102 counting only the distinct ones).

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

The square root of 20201644 is about 4494.6238997273. The cubic root of 20201644 is about 272.3509562869.

Adding to 20201644 its reverse (44610202), we get a palindrome (64811846).

The spelling of 20201644 in words is "twenty million, two hundred one thousand, six hundred forty-four".