20676391 has 8 divisors (see below), whose sum is σ = 21632400. Its totient is φ = 19736640.

The previous prime is 20676371. The next prime is 20676431. The reversal of 20676391 is 19367602.

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

It is a de Polignac number, because none of the positive numbers 2^k-20676391 is a prime.

It is a super-3 number, since 3×20676391³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20676361) 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 7 ways as a sum of consecutive naturals, for example, 1425 + ... + 6586.

It is an arithmetic number, because the mean of its divisors is an integer number (2704050).

Almost surely, 2^20676391 is an apocalyptic number.

20676391 is a deficient number, since it is larger than the sum of its proper divisors (956009).

20676391 is an equidigital number, since it uses as much as digits as its factorization.

20676391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8129.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20676391 is about 4547.1299739506. The cubic root of 20676391 is about 274.4679121929.

The spelling of 20676391 in words is "twenty million, six hundred seventy-six thousand, three hundred ninety-one".