20796864 has 112 divisors (see below), whose sum is σ = 61691520. Its totient is φ = 6128640.

The previous prime is 20796817. The next prime is 20796869. The reversal of 20796864 is 46869702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20796869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90702 + ... + 90930.

Almost surely, 2^20796864 is an apocalyptic number.

20796864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20796864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30845760).

20796864 is an abundant number, since it is smaller than the sum of its proper divisors (40894656).

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

20796864 is a wasteful number, since it uses less digits than its factorization.

20796864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 20796864 is about 4560.3578806931. The cubic root of 20796864 is about 274.9999515151. Note that the first 4 decimals are identical.

The spelling of 20796864 in words is "twenty million, seven hundred ninety-six thousand, eight hundred sixty-four".