20388899 has 8 divisors (see below), whose sum is σ = 21630528. Its totient is φ = 19152000.

The previous prime is 20388883. The next prime is 20388947. The reversal of 20388899 is 99888302.

It is a happy number.

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 20388899 - 2⁴ = 20388883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20388829) 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, 11969 + ... + 13565.

It is an arithmetic number, because the mean of its divisors is an integer number (2703816).

Almost surely, 2^20388899 is an apocalyptic number.

20388899 is a deficient number, since it is larger than the sum of its proper divisors (1241629).

20388899 is a wasteful number, since it uses less digits than its factorization.

20388899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365.

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 20388899 is about 4515.4068476716. The cubic root of 20388899 is about 273.1898700179.

The spelling of 20388899 in words is "twenty million, three hundred eighty-eight thousand, eight hundred ninety-nine".