19995983 has 8 divisors (see below), whose sum is σ = 23227680. Its totient is φ = 16858080.

The previous prime is 19995979. The next prime is 19996001. The reversal of 19995983 is 38959991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19995983 - 2² = 19995979 is a prime.

It is a super-2 number, since 2×19995983² = 799678672272578, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19995953) 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 7 ways as a sum of consecutive naturals, for example, 22988 + ... + 23841.

It is an arithmetic number, because the mean of its divisors is an integer number (2903460).

Almost surely, 2^19995983 is an apocalyptic number.

19995983 is a deficient number, since it is larger than the sum of its proper divisors (3231697).

19995983 is an equidigital number, since it uses as much as digits as its factorization.

19995983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46897.

The product of its digits is 787320, while the sum is 53.

The square root of 19995983 is about 4471.6868181929. The cubic root of 19995983 is about 271.4235874167.

The spelling of 19995983 in words is "nineteen million, nine hundred ninety-five thousand, nine hundred eighty-three".