20005379 has 4 divisors (see below), whose sum is σ = 21182184. Its totient is φ = 18828576.

The previous prime is 20005369. The next prime is 20005393. The reversal of 20005379 is 97350002.

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 20005379 - 2²⁰ = 18956803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20005319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 588377 + ... + 588410.

It is an arithmetic number, because the mean of its divisors is an integer number (5295546).

Almost surely, 2^20005379 is an apocalyptic number.

20005379 is a deficient number, since it is larger than the sum of its proper divisors (1176805).

20005379 is a wasteful number, since it uses less digits than its factorization.

20005379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176804.

The product of its (nonzero) digits is 1890, while the sum is 26.

The square root of 20005379 is about 4472.7373050516. The cubic root of 20005379 is about 271.4660942321.

The spelling of 20005379 in words is "twenty million, five thousand, three hundred seventy-nine".