20011983 has 4 divisors (see below), whose sum is σ = 26682648. Its totient is φ = 13341320.

The previous prime is 20011967. The next prime is 20011987. The reversal of 20011983 is 38911002.

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 20011983 - 2⁴ = 20011967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011987) 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, 3335328 + ... + 3335333.

It is an arithmetic number, because the mean of its divisors is an integer number (6670662).

Almost surely, 2^20011983 is an apocalyptic number.

20011983 is a deficient number, since it is larger than the sum of its proper divisors (6670665).

20011983 is an equidigital number, since it uses as much as digits as its factorization.

20011983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6670664.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 20011983 is about 4473.4754945121. The cubic root of 20011983 is about 271.4959622800.

Adding to 20011983 its reverse (38911002), we get a palindrome (58922985).

The spelling of 20011983 in words is "twenty million, eleven thousand, nine hundred eighty-three".