20438879 has 8 divisors (see below), whose sum is σ = 21682080. Its totient is φ = 19200256.

The previous prime is 20438863. The next prime is 20438909. The reversal of 20438879 is 97883402.

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 20438879 - 2⁴ = 20438863 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 (20438809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13547 + ... + 14979.

It is an arithmetic number, because the mean of its divisors is an integer number (2710260).

Almost surely, 2^20438879 is an apocalyptic number.

20438879 is a deficient number, since it is larger than the sum of its proper divisors (1243201).

20438879 is a wasteful number, since it uses less digits than its factorization.

20438879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2289.

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

The square root of 20438879 is about 4520.9378451821. The cubic root of 20438879 is about 273.4129143979.

The spelling of 20438879 in words is "twenty million, four hundred thirty-eight thousand, eight hundred seventy-nine".