20042836 has 24 divisors (see below), whose sum is σ = 38394720. Its totient is φ = 9079200.

The previous prime is 20042801. The next prime is 20042837. The reversal of 20042836 is 63824002.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20042836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20042837) 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 7 ways as a sum of consecutive naturals, for example, 16531 + ... + 17701.

It is an arithmetic number, because the mean of its divisors is an integer number (1599780).

Almost surely, 2^20042836 is an apocalyptic number.

It is an amenable number.

20042836 is a deficient number, since it is larger than the sum of its proper divisors (18351884).

20042836 is a wasteful number, since it uses less digits than its factorization.

20042836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575 (or 1573 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20042836 is about 4476.9226037536. The cubic root of 20042836 is about 271.6354147915.

Adding to 20042836 its reverse (63824002), we get a palindrome (83866838).

The spelling of 20042836 in words is "twenty million, forty-two thousand, eight hundred thirty-six".