20204646 has 64 divisors (see below), whose sum is σ = 50996736. Its totient is φ = 5184000.

The previous prime is 20204641. The next prime is 20204647. The reversal of 20204646 is 64640202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20204641) 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 31 ways as a sum of consecutive naturals, for example, 46446 + ... + 46878.

It is an arithmetic number, because the mean of its divisors is an integer number (796824).

Almost surely, 2^20204646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20204646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25498368).

20204646 is an abundant number, since it is smaller than the sum of its proper divisors (30792090).

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

20204646 is a wasteful number, since it uses less digits than its factorization.

20204646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 20204646 is about 4494.9578418490. The cubic root of 20204646 is about 272.3644462299.

Adding to 20204646 its reverse (64640202), we get a palindrome (84844848).

Subtracting 20204646 from its reverse (64640202), we obtain a square (44435556 = 6666²).

It can be divided in two parts, 2020 and 4646, that added together give a palindrome (6666).

The spelling of 20204646 in words is "twenty million, two hundred four thousand, six hundred forty-six".