20881379 has 4 divisors (see below), whose sum is σ = 20890584. Its totient is φ = 20872176.

The previous prime is 20881369. The next prime is 20881381. The reversal of 20881379 is 97318802.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20881379 - 2⁸ = 20881123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20881319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1484 + ... + 6630.

It is an arithmetic number, because the mean of its divisors is an integer number (5222646).

Almost surely, 2^20881379 is an apocalyptic number.

20881379 is a deficient number, since it is larger than the sum of its proper divisors (9205).

20881379 is an equidigital number, since it uses as much as digits as its factorization.

20881379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9204.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 20881379 is about 4569.6147540028. The cubic root of 20881379 is about 275.3719660719.

The spelling of 20881379 in words is "twenty million, eight hundred eighty-one thousand, three hundred seventy-nine".