20388479 has 8 divisors (see below), whose sum is σ = 21183120. Its totient is φ = 19600000.

The previous prime is 20388469. The next prime is 20388481. The reversal of 20388479 is 97488302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20388479 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 (20388409) 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, 5879 + ... + 8679.

It is an arithmetic number, because the mean of its divisors is an integer number (2647890).

Almost surely, 2^20388479 is an apocalyptic number.

20388479 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20388479 is a deficient number, since it is larger than the sum of its proper divisors (794641).

20388479 is a wasteful number, since it uses less digits than its factorization.

20388479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3081.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 20388479 is about 4515.3603399950. The cubic root of 20388479 is about 273.1879941518.

The spelling of 20388479 in words is "twenty million, three hundred eighty-eight thousand, four hundred seventy-nine".