20315399 has 8 divisors (see below), whose sum is σ = 22632960. Its totient is φ = 18105696.

The previous prime is 20315387. The next prime is 20315401. The reversal of 20315399 is 99351302.

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 20315399 - 2⁸ = 20315143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315359) 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, 26567 + ... + 27320.

It is an arithmetic number, because the mean of its divisors is an integer number (2829120).

Almost surely, 2^20315399 is an apocalyptic number.

20315399 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20315399 is a deficient number, since it is larger than the sum of its proper divisors (2317561).

20315399 is a wasteful number, since it uses less digits than its factorization.

20315399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53929.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 20315399 is about 4507.2606980293. The cubic root of 20315399 is about 272.8612004472.

The spelling of 20315399 in words is "twenty million, three hundred fifteen thousand, three hundred ninety-nine".