20388879 has 24 divisors (see below), whose sum is σ = 35123712. Its totient is φ = 11143440.

The previous prime is 20388871. The next prime is 20388883. The reversal of 20388879 is 97888302.

It is not a de Polignac number, because 20388879 - 2³ = 20388871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20388871) 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 23 ways as a sum of consecutive naturals, for example, 5587 + ... + 8484.

It is an arithmetic number, because the mean of its divisors is an integer number (1463488).

Almost surely, 2^20388879 is an apocalyptic number.

20388879 is a deficient number, since it is larger than the sum of its proper divisors (14734833).

20388879 is a wasteful number, since it uses less digits than its factorization.

20388879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14107 (or 14104 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 20388879 is about 4515.4046330312. The cubic root of 20388879 is about 273.1897806915.

The spelling of 20388879 in words is "twenty million, three hundred eighty-eight thousand, eight hundred seventy-nine".