20617379 has 4 divisors (see below), whose sum is σ = 21830184. Its totient is φ = 19404576.

The previous prime is 20617357. The next prime is 20617411. The reversal of 20617379 is 97371602.

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 20617379 - 2²⁴ = 3840163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20617879) 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, 606377 + ... + 606410.

It is an arithmetic number, because the mean of its divisors is an integer number (5457546).

Almost surely, 2^20617379 is an apocalyptic number.

20617379 is a deficient number, since it is larger than the sum of its proper divisors (1212805).

20617379 is a wasteful number, since it uses less digits than its factorization.

20617379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212804.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 20617379 is about 4540.6364091391. The cubic root of 20617379 is about 274.2065459164.

The spelling of 20617379 in words is "twenty million, six hundred seventeen thousand, three hundred seventy-nine".