20828786 has 16 divisors (see below), whose sum is σ = 35259840. Its totient is φ = 9140880.

The previous prime is 20828783. The next prime is 20828803. The reversal of 20828786 is 68782802.

It is not an unprimeable number, because it can be changed into a prime (20828783) 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, 15686 + ... + 16961.

It is an arithmetic number, because the mean of its divisors is an integer number (2203740).

Almost surely, 2^20828786 is an apocalyptic number.

20828786 is a deficient number, since it is larger than the sum of its proper divisors (14431054).

20828786 is a wasteful number, since it uses less digits than its factorization.

20828786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32689.

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 20828786 is about 4563.8564832825. The cubic root of 20828786 is about 275.1405826660.

The spelling of 20828786 in words is "twenty million, eight hundred twenty-eight thousand, seven hundred eighty-six".