20798856 has 96 divisors (see below), whose sum is σ = 62986560. Its totient is φ = 6391872.

The previous prime is 20798851. The next prime is 20798867. The reversal of 20798856 is 65889702.

It is not an unprimeable number, because it can be changed into a prime (20798851) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 24861 + ... + 25683.

It is an arithmetic number, because the mean of its divisors is an integer number (656110).

Almost surely, 2^20798856 is an apocalyptic number.

20798856 is a gapful number since it is divisible by the number (26) 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 20798856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31493280).

20798856 is an abundant number, since it is smaller than the sum of its proper divisors (42187704).

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

20798856 is a wasteful number, since it uses less digits than its factorization.

20798856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857 (or 841 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 20798856 is about 4560.5762793752. The cubic root of 20798856 is about 275.0087314032.

The spelling of 20798856 in words is "twenty million, seven hundred ninety-eight thousand, eight hundred fifty-six".