20400204 has 48 divisors (see below), whose sum is σ = 54988416. Its totient is φ = 5817600.

The previous prime is 20400197. The next prime is 20400239. The reversal of 20400204 is 40200402.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 20400204.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2302 + ... + 6789.

It is an arithmetic number, because the mean of its divisors is an integer number (1145592).

Almost surely, 2^20400204 is an apocalyptic number.

It is an amenable number.

20400204 is an abundant number, since it is smaller than the sum of its proper divisors (34588212).

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

20400204 is a wasteful number, since it uses less digits than its factorization.

20400204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9126 (or 9124 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 20400204 is about 4516.6584993776. The cubic root of 20400204 is about 273.2403524045.

Adding to 20400204 its reverse (40200402), we get a palindrome (60600606).

It can be divided in two parts, 20400 and 204, that multiplied together give a square (4161600 = 2040²).

The spelling of 20400204 in words is "twenty million, four hundred thousand, two hundred four".