20603899 has 4 divisors (see below), whose sum is σ = 20808000. Its totient is φ = 20399800.

The previous prime is 20603893. The next prime is 20603917. The reversal of 20603899 is 99830602.

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 20603899 - 2¹¹ = 20601851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20603893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101899 + ... + 102100.

It is an arithmetic number, because the mean of its divisors is an integer number (5202000).

Almost surely, 2^20603899 is an apocalyptic number.

20603899 is a deficient number, since it is larger than the sum of its proper divisors (204101).

20603899 is a wasteful number, since it uses less digits than its factorization.

20603899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204100.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 20603899 is about 4539.1517930116. The cubic root of 20603899 is about 274.1467725556.

The spelling of 20603899 in words is "twenty million, six hundred three thousand, eight hundred ninety-nine".