20975993 has 4 divisors (see below), whose sum is σ = 21081600. Its totient is φ = 20870388.

The previous prime is 20975989. The next prime is 20976031. The reversal of 20975993 is 39957902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20975993 - 2² = 20975989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20975923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52505 + ... + 52902.

It is an arithmetic number, because the mean of its divisors is an integer number (5270400).

Almost surely, 2^20975993 is an apocalyptic number.

It is an amenable number.

20975993 is a deficient number, since it is larger than the sum of its proper divisors (105607).

20975993 is a wasteful number, since it uses less digits than its factorization.

20975993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105606.

The product of its (nonzero) digits is 153090, while the sum is 44.

The square root of 20975993 is about 4579.9555674701. The cubic root of 20975993 is about 275.7872450224.

The spelling of 20975993 in words is "twenty million, nine hundred seventy-five thousand, nine hundred ninety-three".