20684896 has 12 divisors (see below), whose sum is σ = 40723452. Its totient is φ = 10342432.

The previous prime is 20684879. The next prime is 20684897. The reversal of 20684896 is 69848602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20684897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323170 + ... + 323233.

It is an arithmetic number, because the mean of its divisors is an integer number (3393621).

Almost surely, 2^20684896 is an apocalyptic number.

It is an amenable number.

20684896 is a deficient number, since it is larger than the sum of its proper divisors (20038556).

20684896 is an equidigital number, since it uses as much as digits as its factorization.

20684896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646413 (or 646405 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 20684896 is about 4548.0650830875. The cubic root of 20684896 is about 274.5055401264.

The spelling of 20684896 in words is "twenty million, six hundred eighty-four thousand, eight hundred ninety-six".