20976 has 40 divisors (see below), whose sum is σ = 59520. Its totient is φ = 6336.

The previous prime is 20963. The next prime is 20981. The reversal of 20976 is 67902.

20976 = T₃₉ + T₄₀ + ... + T₅₆.

20976 is nontrivially palindromic in base 15.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 901 + ... + 923.

It is an arithmetic number, because the mean of its divisors is an integer number (1488).

2²⁰⁹⁷⁶ 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 20976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29760).

20976 is an abundant number, since it is smaller than the sum of its proper divisors (38544).

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

20976 is a wasteful number, since it uses less digits than its factorization.

20976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 20976 is about 144.8309359219. The cubic root of 20976 is about 27.5787275700.

The spelling of 20976 in words is "twenty thousand, nine hundred seventy-six".