20049 has 8 divisors (see below), whose sum is σ = 27552. Its totient is φ = 12960.

The previous prime is 20047. The next prime is 20051. The reversal of 20049 is 94002.

It is an interprime number because it is at equal distance from previous prime (20047) and next prime (20051).

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

It is not a de Polignac number, because 20049 - 2¹ = 20047 is a prime.

It is a Curzon number.

It is a nialpdrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20049.

It is not an unprimeable number, because it can be changed into a prime (20047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42 + ... + 204.

It is an arithmetic number, because the mean of its divisors is an integer number (3444).

2²⁰⁰⁴⁹ is an apocalyptic number.

It is an amenable number.

20049 is a deficient number, since it is larger than the sum of its proper divisors (7503).

20049 is a wasteful number, since it uses less digits than its factorization.

20049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 20049 is about 141.5944914183. The cubic root of 20049 is about 27.1663258308.

The spelling of 20049 in words is "twenty thousand, forty-nine".