20503983 has 8 divisors (see below), whose sum is σ = 28777600. Its totient is φ = 12949848.

The previous prime is 20503981. The next prime is 20503993. The reversal of 20503983 is 38930502.

It is a happy number.

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

It is not a de Polignac number, because 20503983 - 2¹ = 20503981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20503983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20503981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179803 + ... + 179916.

It is an arithmetic number, because the mean of its divisors is an integer number (3597200).

Almost surely, 2^20503983 is an apocalyptic number.

20503983 is a deficient number, since it is larger than the sum of its proper divisors (8273617).

20503983 is a wasteful number, since it uses less digits than its factorization.

20503983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359741.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20503983 is about 4528.1323964743. The cubic root of 20503983 is about 273.7029076016.

The spelling of 20503983 in words is "twenty million, five hundred three thousand, nine hundred eighty-three".