20361644 has 12 divisors (see below), whose sum is σ = 35860944. Its totient is φ = 10115664.

The previous prime is 20361641. The next prime is 20361659. The reversal of 20361644 is 44616302.

It is not an unprimeable number, because it can be changed into a prime (20361641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15584 + ... + 16839.

It is an arithmetic number, because the mean of its divisors is an integer number (2988412).

Almost surely, 2^20361644 is an apocalyptic number.

It is an amenable number.

20361644 is a deficient number, since it is larger than the sum of its proper divisors (15499300).

20361644 is a wasteful number, since it uses less digits than its factorization.

20361644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32584 (or 32582 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20361644 is about 4512.3878379412. The cubic root of 20361644 is about 273.0680862618.

Adding to 20361644 its reverse (44616302), we get a palindrome (64977946).

The spelling of 20361644 in words is "twenty million, three hundred sixty-one thousand, six hundred forty-four".