20163983 has 4 divisors (see below), whose sum is σ = 23044560. Its totient is φ = 17283408.

The previous prime is 20163931. The next prime is 20163991. The reversal of 20163983 is 38936102.

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 20163983 - 2¹⁰ = 20162959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20163083) 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, 1440278 + ... + 1440291.

It is an arithmetic number, because the mean of its divisors is an integer number (5761140).

Almost surely, 2^20163983 is an apocalyptic number.

20163983 is a deficient number, since it is larger than the sum of its proper divisors (2880577).

20163983 is an equidigital number, since it uses as much as digits as its factorization.

20163983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2880576.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 20163983 is about 4490.4323845260. The cubic root of 20163983 is about 272.1816072005.

The spelling of 20163983 in words is "twenty million, one hundred sixty-three thousand, nine hundred eighty-three".