20318983 has 4 divisors (see below), whose sum is σ = 20339368. Its totient is φ = 20298600.

The previous prime is 20318971. The next prime is 20318989. The reversal of 20318983 is 38981302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38981302 = 2 ⋅19490651.

It is a cyclic number.

It is not a de Polignac number, because 20318983 - 2⁹ = 20318471 is a prime.

It is a super-2 number, since 2×20318983² = 825722140308578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20318989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8616 + ... + 10717.

It is an arithmetic number, because the mean of its divisors is an integer number (5084842).

Almost surely, 2^20318983 is an apocalyptic number.

20318983 is a deficient number, since it is larger than the sum of its proper divisors (20385).

20318983 is a wasteful number, since it uses less digits than its factorization.

20318983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20384.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 20318983 is about 4507.6582612261. The cubic root of 20318983 is about 272.8772453702.

The spelling of 20318983 in words is "twenty million, three hundred eighteen thousand, nine hundred eighty-three".