20393423 has 4 divisors (see below), whose sum is σ = 20437560. Its totient is φ = 20349288.

The previous prime is 20393411. The next prime is 20393431. The reversal of 20393423 is 32439302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20393423 - 2⁴ = 20393407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20393392 and 20393401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20393473) 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, 21368 + ... + 22301.

It is an arithmetic number, because the mean of its divisors is an integer number (5109390).

Almost surely, 2^20393423 is an apocalyptic number.

20393423 is a deficient number, since it is larger than the sum of its proper divisors (44137).

20393423 is an equidigital number, since it uses as much as digits as its factorization.

20393423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44136.

The product of its (nonzero) digits is 3888, while the sum is 26.

The square root of 20393423 is about 4515.9077714231. The cubic root of 20393423 is about 273.2100741426.

The spelling of 20393423 in words is "twenty million, three hundred ninety-three thousand, four hundred twenty-three".