20132399 has 4 divisors (see below), whose sum is σ = 23008464. Its totient is φ = 17256336.

The previous prime is 20132389. The next prime is 20132401. The reversal of 20132399 is 99323102.

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 20132399 - 2¹⁶ = 20066863 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 (20132389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1438022 + ... + 1438035.

It is an arithmetic number, because the mean of its divisors is an integer number (5752116).

Almost surely, 2^20132399 is an apocalyptic number.

20132399 is a deficient number, since it is larger than the sum of its proper divisors (2876065).

20132399 is an equidigital number, since it uses as much as digits as its factorization.

20132399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2876064.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 20132399 is about 4486.9141957475. The cubic root of 20132399 is about 272.0394217300.

The spelling of 20132399 in words is "twenty million, one hundred thirty-two thousand, three hundred ninety-nine".