20676816 has 80 divisors (see below), whose sum is σ = 61960320. Its totient is φ = 6589440.

The previous prime is 20676809. The next prime is 20676847. The reversal of 20676816 is 61867602.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8896 + ... + 10976.

It is an arithmetic number, because the mean of its divisors is an integer number (774504).

Almost surely, 2^20676816 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 20676816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30980160).

20676816 is an abundant number, since it is smaller than the sum of its proper divisors (41283504).

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

20676816 is a wasteful number, since it uses less digits than its factorization.

20676816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121 (or 2109 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20676816 is about 4547.1767064850. The cubic root of 20676816 is about 274.4697927284.

The spelling of 20676816 in words is "twenty million, six hundred seventy-six thousand, eight hundred sixteen".