20676399 has 4 divisors (see below), whose sum is σ = 27568536. Its totient is φ = 13784264.

The previous prime is 20676371. The next prime is 20676431. The reversal of 20676399 is 99367602.

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 20676399 - 2⁵ = 20676367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20676399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20676329) 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, 3446064 + ... + 3446069.

It is an arithmetic number, because the mean of its divisors is an integer number (6892134).

Almost surely, 2^20676399 is an apocalyptic number.

20676399 is a deficient number, since it is larger than the sum of its proper divisors (6892137).

20676399 is an equidigital number, since it uses as much as digits as its factorization.

20676399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6892136.

The product of its (nonzero) digits is 122472, while the sum is 42.

The square root of 20676399 is about 4547.1308536263. The cubic root of 20676399 is about 274.4679475914.

The spelling of 20676399 in words is "twenty million, six hundred seventy-six thousand, three hundred ninety-nine".