20512983 has 8 divisors (see below), whose sum is σ = 27417600. Its totient is φ = 13641848.

The previous prime is 20512981. The next prime is 20512991. The reversal of 20512983 is 38921502.

It is a happy number.

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 20512983 - 2¹ = 20512981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20512983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20512981) 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 7 ways as a sum of consecutive naturals, for example, 6903 + ... + 9416.

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

Almost surely, 2^20512983 is an apocalyptic number.

20512983 is a deficient number, since it is larger than the sum of its proper divisors (6904617).

20512983 is a wasteful number, since it uses less digits than its factorization.

20512983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16741.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 20512983 is about 4529.1260746418. The cubic root of 20512983 is about 273.7429480471.

The spelling of 20512983 in words is "twenty million, five hundred twelve thousand, nine hundred eighty-three".