20090823 has 8 divisors (see below), whose sum is σ = 27711600. Its totient is φ = 12931968.

The previous prime is 20090813. The next prime is 20090827. The reversal of 20090823 is 32809002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20090823 - 2¹⁰ = 20089799 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20090793 and 20090802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20090827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115378 + ... + 115551.

It is an arithmetic number, because the mean of its divisors is an integer number (3463950).

Almost surely, 2^20090823 is an apocalyptic number.

20090823 is a deficient number, since it is larger than the sum of its proper divisors (7620777).

20090823 is a wasteful number, since it uses less digits than its factorization.

20090823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230961.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20090823 is about 4482.2787731242. The cubic root of 20090823 is about 271.8520271777.

Adding to 20090823 its reverse (32809002), we get a palindrome (52899825).

The spelling of 20090823 in words is "twenty million, ninety thousand, eight hundred twenty-three".