20735993 has 4 divisors (see below), whose sum is σ = 21404928. Its totient is φ = 20067060.

The previous prime is 20735969. The next prime is 20736017. The reversal of 20735993 is 39953702.

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 an interprime number because it is at equal distance from previous prime (20735969) and next prime (20736017).

It is a cyclic number.

It is not a de Polignac number, because 20735993 - 2¹⁰ = 20734969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20735293) 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, 334421 + ... + 334482.

It is an arithmetic number, because the mean of its divisors is an integer number (5351232).

Almost surely, 2^20735993 is an apocalyptic number.

It is an amenable number.

20735993 is a deficient number, since it is larger than the sum of its proper divisors (668935).

20735993 is an equidigital number, since it uses as much as digits as its factorization.

20735993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668934.

The product of its (nonzero) digits is 51030, while the sum is 38.

The square root of 20735993 is about 4553.6790620332. The cubic root of 20735993 is about 274.7313872984.

The spelling of 20735993 in words is "twenty million, seven hundred thirty-five thousand, nine hundred ninety-three".