20680764 has 48 divisors (see below), whose sum is σ = 53192832. Its totient is φ = 6213312.

The previous prime is 20680747. The next prime is 20680787. The reversal of 20680764 is 46708602.

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, 5167 + ... + 8249.

It is an arithmetic number, because the mean of its divisors is an integer number (1108184).

Almost surely, 2^20680764 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 20680764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26596416).

20680764 is an abundant number, since it is smaller than the sum of its proper divisors (32512068).

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

20680764 is a wasteful number, since it uses less digits than its factorization.

20680764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3146 (or 3144 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 20680764 is about 4547.6108012890. The cubic root of 20680764 is about 274.4872605658.

The spelling of 20680764 in words is "twenty million, six hundred eighty thousand, seven hundred sixty-four".