20003399 has 16 divisors (see below), whose sum is σ = 22680000. Its totient is φ = 17504256.

The previous prime is 20003393. The next prime is 20003443. The reversal of 20003399 is 99330002.

It is a cyclic number.

It is not a de Polignac number, because 20003399 - 2⁴ = 20003383 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 (20003393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44327 + ... + 44775.

It is an arithmetic number, because the mean of its divisors is an integer number (1417500).

Almost surely, 2^20003399 is an apocalyptic number.

20003399 is a deficient number, since it is larger than the sum of its proper divisors (2676601).

20003399 is a wasteful number, since it uses less digits than its factorization.

20003399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634.

The product of its (nonzero) digits is 1458, while the sum is 26.

The square root of 20003399 is about 4472.5159586076. The cubic root of 20003399 is about 271.4571379643.

It can be divided in two parts, 20003 and 399, that added together give a palindrome (20402).

The spelling of 20003399 in words is "twenty million, three thousand, three hundred ninety-nine".