20494823 has 4 divisors (see below), whose sum is σ = 20775648. Its totient is φ = 20214000.

The previous prime is 20494807. The next prime is 20494829. The reversal of 20494823 is 32849402.

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 20494823 - 2⁴ = 20494807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20494823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20494829) 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, 140303 + ... + 140448.

It is an arithmetic number, because the mean of its divisors is an integer number (5193912).

Almost surely, 2^20494823 is an apocalyptic number.

20494823 is a deficient number, since it is larger than the sum of its proper divisors (280825).

20494823 is an equidigital number, since it uses as much as digits as its factorization.

20494823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280824.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 20494823 is about 4527.1208289596. The cubic root of 20494823 is about 273.6621432930.

The spelling of 20494823 in words is "twenty million, four hundred ninety-four thousand, eight hundred twenty-three".