20204399 has 8 divisors (see below), whose sum is σ = 20570112. Its totient is φ = 19841080.

The previous prime is 20204389. The next prime is 20204411. The reversal of 20204399 is 99340202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20204399 is a prime.

It is a super-4 number, since 4×20204399⁴ (a number of 30 digits) contains 4444 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 (20204369) 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, 26822 + ... + 27564.

It is an arithmetic number, because the mean of its divisors is an integer number (2571264).

Almost surely, 2^20204399 is an apocalyptic number.

20204399 is a deficient number, since it is larger than the sum of its proper divisors (365713).

20204399 is an equidigital number, since it uses as much as digits as its factorization.

20204399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 20204399 is about 4494.9303665352. The cubic root of 20204399 is about 272.3633363483.

The spelling of 20204399 in words is "twenty million, two hundred four thousand, three hundred ninety-nine".