20053643 has 4 divisors (see below), whose sum is σ = 20072928. Its totient is φ = 20034360.

The previous prime is 20053639. The next prime is 20053673. The reversal of 20053643 is 34635002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20053643 - 2² = 20053639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20053603) 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, 7988 + ... + 10193.

It is an arithmetic number, because the mean of its divisors is an integer number (5018232).

Almost surely, 2^20053643 is an apocalyptic number.

20053643 is a deficient number, since it is larger than the sum of its proper divisors (19285).

20053643 is a wasteful number, since it uses less digits than its factorization.

20053643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19284.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 20053643 is about 4478.1294085812. The cubic root of 20053643 is about 271.6842275189.

Adding to 20053643 its reverse (34635002), we get a palindrome (54688645).

The spelling of 20053643 in words is "twenty million, fifty-three thousand, six hundred forty-three".