20605379 has 4 divisors (see below), whose sum is σ = 20624760. Its totient is φ = 20586000.

The previous prime is 20605349. The next prime is 20605391. The reversal of 20605379 is 97350602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20605379 - 2¹² = 20601283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20605339) 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 3 ways as a sum of consecutive naturals, for example, 7997 + ... + 10254.

It is an arithmetic number, because the mean of its divisors is an integer number (5156190).

Almost surely, 2^20605379 is an apocalyptic number.

20605379 is a deficient number, since it is larger than the sum of its proper divisors (19381).

20605379 is a wasteful number, since it uses less digits than its factorization.

20605379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19380.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 20605379 is about 4539.3148161369. The cubic root of 20605379 is about 274.1533364833.

The spelling of 20605379 in words is "twenty million, six hundred five thousand, three hundred seventy-nine".