20881679 has 8 divisors (see below), whose sum is σ = 25700640. Its totient is φ = 16521696.

The previous prime is 20881673. The next prime is 20881687. The reversal of 20881679 is 97618802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20881679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20881673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114644 + ... + 114825.

It is an arithmetic number, because the mean of its divisors is an integer number (3212580).

Almost surely, 2^20881679 is an apocalyptic number.

20881679 is a deficient number, since it is larger than the sum of its proper divisors (4818961).

20881679 is a wasteful number, since it uses less digits than its factorization.

20881679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229489.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 20881679 is about 4569.6475794092. The cubic root of 20881679 is about 275.3732848097.

The spelling of 20881679 in words is "twenty million, eight hundred eighty-one thousand, six hundred seventy-nine".