20623423 has 4 divisors (see below), whose sum is σ = 20700360. Its totient is φ = 20546488.

The previous prime is 20623411. The next prime is 20623439. The reversal of 20623423 is 32432602.

It is a happy number.

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 20623423 - 2⁹ = 20622911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20623394 and 20623403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20623453) 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, 38065 + ... + 38602.

It is an arithmetic number, because the mean of its divisors is an integer number (5175090).

Almost surely, 2^20623423 is an apocalyptic number.

20623423 is a deficient number, since it is larger than the sum of its proper divisors (76937).

20623423 is an equidigital number, since it uses as much as digits as its factorization.

20623423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76936.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 20623423 is about 4541.3019058415. The cubic root of 20623423 is about 274.2333379163.

The spelling of 20623423 in words is "twenty million, six hundred twenty-three thousand, four hundred twenty-three".