20864896 has 32 divisors (see below), whose sum is σ = 44767800. Its totient is φ = 9629184.

The previous prime is 20864863. The next prime is 20864923. The reversal of 20864896 is 69846802.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4606 + ... + 7933.

Almost surely, 2^20864896 is an apocalyptic number.

20864896 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20864896 is an abundant number, since it is smaller than the sum of its proper divisors (23902904).

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

20864896 is a wasteful number, since it uses less digits than its factorization.

20864896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12566 (or 12554 counting only the distinct ones).

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

The square root of 20864896 is about 4567.8108542277. The cubic root of 20864896 is about 275.2994907988.

The spelling of 20864896 in words is "twenty million, eight hundred sixty-four thousand, eight hundred ninety-six".