20312993 has 8 divisors (see below), whose sum is σ = 20806368. Its totient is φ = 19825344.

The previous prime is 20312989. The next prime is 20313001. The reversal of 20312993 is 39921302.

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 20312993 - 2² = 20312989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20312923) 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, 6230 + ... + 8912.

It is an arithmetic number, because the mean of its divisors is an integer number (2600796).

Almost surely, 2^20312993 is an apocalyptic number.

It is an amenable number.

20312993 is a deficient number, since it is larger than the sum of its proper divisors (493375).

20312993 is a wasteful number, since it uses less digits than its factorization.

20312993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2863.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 20312993 is about 4506.9937874375. The cubic root of 20312993 is about 272.8504281595.

It can be divided in two parts, 2031299 and 3, that added together give a palindrome (2031302).

The spelling of 20312993 in words is "twenty million, three hundred twelve thousand, nine hundred ninety-three".