20660976 has 120 divisors (see below), whose sum is σ = 67059200. Its totient is φ = 5816448.

The previous prime is 20660953. The next prime is 20660977. The reversal of 20660976 is 67906602.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20660976.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103725 + ... + 103923.

Almost surely, 2^20660976 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 20660976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33529600).

20660976 is an abundant number, since it is smaller than the sum of its proper divisors (46398224).

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

20660976 is a wasteful number, since it uses less digits than its factorization.

20660976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 314 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 20660976 is about 4545.4346326837. The cubic root of 20660976 is about 274.3996866381.

The spelling of 20660976 in words is "twenty million, six hundred sixty thousand, nine hundred seventy-six".