20641336 has 8 divisors (see below), whose sum is σ = 38702520. Its totient is φ = 10320664.

The previous prime is 20641307. The next prime is 20641339. The reversal of 20641336 is 63314602.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 20641336.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20641339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1290076 + ... + 1290091.

It is an arithmetic number, because the mean of its divisors is an integer number (4837815).

Almost surely, 2^20641336 is an apocalyptic number.

It is an amenable number.

20641336 is a deficient number, since it is larger than the sum of its proper divisors (18061184).

20641336 is a wasteful number, since it uses less digits than its factorization.

20641336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2580173 (or 2580169 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 20641336 is about 4543.2737095623. The cubic root of 20641336 is about 274.3127123929.

Adding to 20641336 its reverse (63314602), we get a palindrome (83955938).

The spelling of 20641336 in words is "twenty million, six hundred forty-one thousand, three hundred thirty-six".