20293993 has 4 divisors (see below), whose sum is σ = 20303248. Its totient is φ = 20284740.

The previous prime is 20293963. The next prime is 20294003. The reversal of 20293993 is 39939202.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20293993 - 2⁵ = 20293961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20293913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 730 + ... + 6412.

It is an arithmetic number, because the mean of its divisors is an integer number (5075812).

Almost surely, 2^20293993 is an apocalyptic number.

It is an amenable number.

20293993 is a deficient number, since it is larger than the sum of its proper divisors (9255).

20293993 is an equidigital number, since it uses as much as digits as its factorization.

20293993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9254.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 20293993 is about 4504.8854591432. The cubic root of 20293993 is about 272.7653303220.

The spelling of 20293993 in words is "twenty million, two hundred ninety-three thousand, nine hundred ninety-three".