20463823 has 4 divisors (see below), whose sum is σ = 20554200. Its totient is φ = 20373448.

The previous prime is 20463811. The next prime is 20463889. The reversal of 20463823 is 32836402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32836402 = 2 ⋅16418201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20463823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20463791 and 20463800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20463803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44848 + ... + 45301.

It is an arithmetic number, because the mean of its divisors is an integer number (5138550).

Almost surely, 2^20463823 is an apocalyptic number.

20463823 is a deficient number, since it is larger than the sum of its proper divisors (90377).

20463823 is an equidigital number, since it uses as much as digits as its factorization.

20463823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90376.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 20463823 is about 4523.6957236313. The cubic root of 20463823 is about 273.5240953029.

The spelling of 20463823 in words is "twenty million, four hundred sixty-three thousand, eight hundred twenty-three".