20617983 has 20 divisors (see below), whose sum is σ = 32423160. Its totient is φ = 13020912.

The previous prime is 20617981. The next prime is 20617999. The reversal of 20617983 is 38971602.

It is not a de Polignac number, because 20617983 - 2¹ = 20617981 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20617981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5160 + ... + 8237.

It is an arithmetic number, because the mean of its divisors is an integer number (1621158).

Almost surely, 2^20617983 is an apocalyptic number.

20617983 is a deficient number, since it is larger than the sum of its proper divisors (11805177).

20617983 is a wasteful number, since it uses less digits than its factorization.

20617983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13428 (or 13419 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 20617983 is about 4540.7029191525. The cubic root of 20617983 is about 274.2092235788.

The spelling of 20617983 in words is "twenty million, six hundred seventeen thousand, nine hundred eighty-three".