20818042 has 16 divisors (see below), whose sum is σ = 36417600. Its totient is φ = 8921724.

The previous prime is 20818009. The next prime is 20818073. The reversal of 20818042 is 24081802.

It is a junction number, because it is equal to n+sod(n) for n = 20817998 and 20818016.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14488 + ... + 15859.

It is an arithmetic number, because the mean of its divisors is an integer number (2276100).

Almost surely, 2^20818042 is an apocalyptic number.

20818042 is a deficient number, since it is larger than the sum of its proper divisors (15599558).

20818042 is an equidigital number, since it uses as much as digits as its factorization.

20818042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30370 (or 30356 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 20818042 is about 4562.6792567525. The cubic root of 20818042 is about 275.0932664367.

Adding to 20818042 its reverse (24081802), we get a palindrome (44899844).

The spelling of 20818042 in words is "twenty million, eight hundred eighteen thousand, forty-two".