20797056 has 96 divisors (see below), whose sum is σ = 68421600. Its totient is φ = 5939712.

The previous prime is 20797033. The next prime is 20797057. The reversal of 20797056 is 65079702.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20797056.

It is not an unprimeable number, because it can be changed into a prime (20797057) 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 11 ways as a sum of consecutive naturals, for example, 6775 + ... + 9353.

It is an arithmetic number, because the mean of its divisors is an integer number (712725).

Almost surely, 2^20797056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20797056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34210800).

20797056 is an abundant number, since it is smaller than the sum of its proper divisors (47624544).

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

20797056 is a wasteful number, since it uses less digits than its factorization.

20797056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2606 (or 2591 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 20797056 is about 4560.3789316240. The cubic root of 20797056 is about 275.0007977938. Note that the first 3 decimals are identical.

The spelling of 20797056 in words is "twenty million, seven hundred ninety-seven thousand, fifty-six".