20204536 has 32 divisors (see below), whose sum is σ = 41500800. Its totient is φ = 9145440.

The previous prime is 20204533. The next prime is 20204563. The reversal of 20204536 is 63540202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20204533) 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, 38371 + ... + 38893.

It is an arithmetic number, because the mean of its divisors is an integer number (1296900).

Almost surely, 2^20204536 is an apocalyptic number.

It is an amenable number.

20204536 is an abundant number, since it is smaller than the sum of its proper divisors (21296264).

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

20204536 is a wasteful number, since it uses less digits than its factorization.

20204536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979 (or 975 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 20204536 is about 4494.9456059000. The cubic root of 20204536 is about 272.3639519518.

Adding to 20204536 its reverse (63540202), we get a palindrome (83744738).

It can be divided in two parts, 2020 and 4536, that added together give a palindrome (6556).

The spelling of 20204536 in words is "twenty million, two hundred four thousand, five hundred thirty-six".