20686828 has 12 divisors (see below), whose sum is σ = 36392832. Its totient is φ = 10288880.

The previous prime is 20686793. The next prime is 20686843. The reversal of 20686828 is 82868602.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12775 + ... + 14302.

It is an arithmetic number, because the mean of its divisors is an integer number (3032736).

Almost surely, 2^20686828 is an apocalyptic number.

It is an amenable number.

20686828 is a deficient number, since it is larger than the sum of its proper divisors (15706004).

20686828 is a wasteful number, since it uses less digits than its factorization.

20686828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27272 (or 27270 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 20686828 is about 4548.2774761441. The cubic root of 20686828 is about 274.5140862687.

The spelling of 20686828 in words is "twenty million, six hundred eighty-six thousand, eight hundred twenty-eight".