20317983 has 16 divisors (see below), whose sum is σ = 31024896. Its totient is φ = 11586240.

The previous prime is 20317981. The next prime is 20317991. The reversal of 20317983 is 38971302.

It is not a de Polignac number, because 20317983 - 2¹ = 20317981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20317981) 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 15 ways as a sum of consecutive naturals, for example, 16435 + ... + 17627.

It is an arithmetic number, because the mean of its divisors is an integer number (1939056).

Almost surely, 2^20317983 is an apocalyptic number.

20317983 is a deficient number, since it is larger than the sum of its proper divisors (10706913).

20317983 is a wasteful number, since it uses less digits than its factorization.

20317983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2014.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20317983 is about 4507.5473375218. The cubic root of 20317983 is about 272.8727687399.

It can be divided in two parts, 20 and 317983, that added together give a triangular number (318003 = T₇₉₇).

The spelling of 20317983 in words is "twenty million, three hundred seventeen thousand, nine hundred eighty-three".