20877 has 4 divisors (see below), whose sum is σ = 27840. Its totient is φ = 13916.

The previous prime is 20873. The next prime is 20879. The reversal of 20877 is 77802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20877 - 2² = 20873 is a prime.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20877.

It is not an unprimeable number, because it can be changed into a prime (20873) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3477 + ... + 3482.

It is an arithmetic number, because the mean of its divisors is an integer number (6960).

2²⁰⁸⁷⁷ is an apocalyptic number.

It is an amenable number.

20877 is a deficient number, since it is larger than the sum of its proper divisors (6963).

20877 is an equidigital number, since it uses as much as digits as its factorization.

20877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6962.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 20877 is about 144.4887538876. The cubic root of 20877 is about 27.5352715457.

The spelling of 20877 in words is "twenty thousand, eight hundred seventy-seven".