20993205 has 8 divisors (see below), whose sum is σ = 33589152. Its totient is φ = 11196368.

The previous prime is 20993201. The next prime is 20993207. The reversal of 20993205 is 50239902.

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 20993205 - 2² = 20993201 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20993201) 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, 699759 + ... + 699788.

It is an arithmetic number, because the mean of its divisors is an integer number (4198644).

Almost surely, 2^20993205 is an apocalyptic number.

It is an amenable number.

20993205 is a deficient number, since it is larger than the sum of its proper divisors (12595947).

20993205 is a wasteful number, since it uses less digits than its factorization.

20993205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399555.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 20993205 is about 4581.8342396905. The cubic root of 20993205 is about 275.8626574601.

The spelling of 20993205 in words is "twenty million, nine hundred ninety-three thousand, two hundred five".