20438679 has 8 divisors (see below), whose sum is σ = 27361152. Its totient is φ = 13571000.

The previous prime is 20438669. The next prime is 20438681. The reversal of 20438679 is 97683402.

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 20438679 - 2¹¹ = 20436631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20438659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12819 + ... + 14324.

It is an arithmetic number, because the mean of its divisors is an integer number (3420144).

Almost surely, 2^20438679 is an apocalyptic number.

20438679 is a deficient number, since it is larger than the sum of its proper divisors (6922473).

20438679 is a wasteful number, since it uses less digits than its factorization.

20438679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27397.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 20438679 is about 4520.9157258237. The cubic root of 20438679 is about 273.4120225884.

It can be divided in two parts, 204 and 38679, that added together give a palindrome (38883).

The spelling of 20438679 in words is "twenty million, four hundred thirty-eight thousand, six hundred seventy-nine".