20539983 has 8 divisors (see below), whose sum is σ = 27417600. Its totient is φ = 13677848.

The previous prime is 20539979. The next prime is 20539993. The reversal of 20539983 is 38993502.

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

It is a cyclic number.

It is not a de Polignac number, because 20539983 - 2² = 20539979 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20539933) 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, 303 + ... + 6416.

It is an arithmetic number, because the mean of its divisors is an integer number (3427200).

Almost surely, 2^20539983 is an apocalyptic number.

20539983 is a deficient number, since it is larger than the sum of its proper divisors (6877617).

20539983 is a wasteful number, since it uses less digits than its factorization.

20539983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7741.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 20539983 is about 4532.1058019424. The cubic root of 20539983 is about 273.8629991576.

The spelling of 20539983 in words is "twenty million, five hundred thirty-nine thousand, nine hundred eighty-three".