20828856 has 32 divisors (see below), whose sum is σ = 53285760. Its totient is φ = 6781152.

The previous prime is 20828851. The next prime is 20828867. The reversal of 20828856 is 65882802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20828851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9060 + ... + 11123.

It is an arithmetic number, because the mean of its divisors is an integer number (1665180).

Almost surely, 2^20828856 is an apocalyptic number.

It is an amenable number.

20828856 is an abundant number, since it is smaller than the sum of its proper divisors (32456904).

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

20828856 is a wasteful number, since it uses less digits than its factorization.

20828856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20235 (or 20231 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 39.

The square root of 20828856 is about 4563.8641522289. The cubic root of 20828856 is about 275.1408908904.

The spelling of 20828856 in words is "twenty million, eight hundred twenty-eight thousand, eight hundred fifty-six".