20403399 has 8 divisors (see below), whose sum is σ = 27265392. Its totient is φ = 13571840.

The previous prime is 20403389. The next prime is 20403401. The reversal of 20403399 is 99330402.

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

It is not a de Polignac number, because 20403399 - 2⁵ = 20403367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20403329) 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, 5994 + ... + 8759.

It is an arithmetic number, because the mean of its divisors is an integer number (3408174).

Almost surely, 2^20403399 is an apocalyptic number.

20403399 is a deficient number, since it is larger than the sum of its proper divisors (6861993).

20403399 is a wasteful number, since it uses less digits than its factorization.

20403399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15217.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 20403399 is about 4517.0121762067. The cubic root of 20403399 is about 273.2546162710.

It can be divided in two parts, 20403 and 399, that added together give a palindrome (20802).

The spelling of 20403399 in words is "twenty million, four hundred three thousand, three hundred ninety-nine".