20436042 has 16 divisors (see below), whose sum is σ = 44587872. Its totient is φ = 6192720.

The previous prime is 20436041. The next prime is 20436047. The reversal of 20436042 is 24063402.

It is not an unprimeable number, because it can be changed into a prime (20436041) 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 7 ways as a sum of consecutive naturals, for example, 154753 + ... + 154884.

It is an arithmetic number, because the mean of its divisors is an integer number (2786742).

Almost surely, 2^20436042 is an apocalyptic number.

20436042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20436042 is an abundant number, since it is smaller than the sum of its proper divisors (24151830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20436042 is a wasteful number, since it uses less digits than its factorization.

20436042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309653.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 20436042 is about 4520.6240719617. The cubic root of 20436042 is about 273.4002635357.

Adding to 20436042 its reverse (24063402), we get a palindrome (44499444).

It can be divided in two parts, 204360 and 42, that added together give a palindrome (204402).

The spelling of 20436042 in words is "twenty million, four hundred thirty-six thousand, forty-two".