19916983 has 4 divisors (see below), whose sum is σ = 19950088. Its totient is φ = 19883880.

The previous prime is 19916977. The next prime is 19916987. The reversal of 19916983 is 38961991.

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 19916983 - 2⁵ = 19916951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19916987) 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, 15633 + ... + 16858.

It is an arithmetic number, because the mean of its divisors is an integer number (4987522).

Almost surely, 2^19916983 is an apocalyptic number.

19916983 is a deficient number, since it is larger than the sum of its proper divisors (33105).

19916983 is an equidigital number, since it uses as much as digits as its factorization.

19916983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33104.

The product of its digits is 104976, while the sum is 46.

The square root of 19916983 is about 4462.8447205790. The cubic root of 19916983 is about 271.0656694656.

The spelling of 19916983 in words is "nineteen million, nine hundred sixteen thousand, nine hundred eighty-three".