20364644 has 12 divisors (see below), whose sum is σ = 36787968. Its totient is φ = 9853800.

The previous prime is 20364571. The next prime is 20364649. The reversal of 20364644 is 44646302.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20364649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81992 + ... + 82239.

It is an arithmetic number, because the mean of its divisors is an integer number (3065664).

Almost surely, 2^20364644 is an apocalyptic number.

It is an amenable number.

20364644 is a deficient number, since it is larger than the sum of its proper divisors (16423324).

20364644 is a wasteful number, since it uses less digits than its factorization.

20364644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164266 (or 164264 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 20364644 is about 4512.7202439327. The cubic root of 20364644 is about 273.0814965088.

The spelling of 20364644 in words is "twenty million, three hundred sixty-four thousand, six hundred forty-four".