20394689 has 8 divisors (see below), whose sum is σ = 23337408. Its totient is φ = 17459280.

The previous prime is 20394643. The next prime is 20394691. The reversal of 20394689 is 98649302.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20394689 - 2²⁴ = 3617473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20394389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7034 + ... + 9500.

It is an arithmetic number, because the mean of its divisors is an integer number (2917176).

Almost surely, 2^20394689 is an apocalyptic number.

It is an amenable number.

20394689 is a deficient number, since it is larger than the sum of its proper divisors (2942719).

20394689 is a wasteful number, since it uses less digits than its factorization.

20394689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3655.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 20394689 is about 4516.0479404010. The cubic root of 20394689 is about 273.2157275469.

The spelling of 20394689 in words is "twenty million, three hundred ninety-four thousand, six hundred eighty-nine".