20023493 has 4 divisors (see below), whose sum is σ = 22884000. Its totient is φ = 17162988.

The previous prime is 20023469. The next prime is 20023513. The reversal of 20023493 is 39432002.

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 an emirpimes, since its reverse is a distinct semiprime: 39432002 = 2 ⋅19716001.

It is a cyclic number.

It is not a de Polignac number, because 20023493 - 2⁶ = 20023429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023403) 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, 1430243 + ... + 1430256.

It is an arithmetic number, because the mean of its divisors is an integer number (5721000).

Almost surely, 2^20023493 is an apocalyptic number.

It is an amenable number.

20023493 is a deficient number, since it is larger than the sum of its proper divisors (2860507).

20023493 is an equidigital number, since it uses as much as digits as its factorization.

20023493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2860506.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20023493 is about 4474.7617813689. The cubic root of 20023493 is about 271.5480030933.

Adding to 20023493 its reverse (39432002), we get a palindrome (59455495).

The spelling of 20023493 in words is "twenty million, twenty-three thousand, four hundred ninety-three".