20018823 has 16 divisors (see below), whose sum is σ = 29289600. Its totient is φ = 12061280.

The previous prime is 20018821. The next prime is 20018833. The reversal of 20018823 is 32881002.

It is not a de Polignac number, because 20018823 - 2¹ = 20018821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20018793 and 20018802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20018821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4213 + ... + 7601.

It is an arithmetic number, because the mean of its divisors is an integer number (1830600).

Almost surely, 2^20018823 is an apocalyptic number.

20018823 is a deficient number, since it is larger than the sum of its proper divisors (9270777).

20018823 is a wasteful number, since it uses less digits than its factorization.

20018823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3582.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 20018823 is about 4474.2399354527. The cubic root of 20018823 is about 271.5268907633.

Adding to 20018823 its reverse (32881002), we get a palindrome (52899825).

The spelling of 20018823 in words is "twenty million, eighteen thousand, eight hundred twenty-three".