20045399 has 8 divisors (see below), whose sum is σ = 23018880. Its totient is φ = 17263800.

The previous prime is 20045387. The next prime is 20045411. The reversal of 20045399 is 99354002.

It is an interprime number because it is at equal distance from previous prime (20045387) and next prime (20045411).

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 20045399 - 2²⁴ = 3268183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20045339) 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, 47747 + ... + 48164.

It is an arithmetic number, because the mean of its divisors is an integer number (2877360).

Almost surely, 2^20045399 is an apocalyptic number.

20045399 is a deficient number, since it is larger than the sum of its proper divisors (2973481).

20045399 is a wasteful number, since it uses less digits than its factorization.

20045399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95941.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 20045399 is about 4477.2088403379. The cubic root of 20045399 is about 271.6469928585.

The spelling of 20045399 in words is "twenty million, forty-five thousand, three hundred ninety-nine".