20438885 has 8 divisors (see below), whose sum is σ = 24567840. Its totient is φ = 16323664.

The previous prime is 20438863. The next prime is 20438909. The reversal of 20438885 is 58883402.

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 20438885 - 2¹⁰ = 20437861 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 194 + ... + 6396.

It is an arithmetic number, because the mean of its divisors is an integer number (3070980).

Almost surely, 2^20438885 is an apocalyptic number.

It is an amenable number.

20438885 is a deficient number, since it is larger than the sum of its proper divisors (4128955).

20438885 is an equidigital number, since it uses as much as digits as its factorization.

20438885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6867.

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 20438885 is about 4520.9385087612. The cubic root of 20438885 is about 273.4129411521.

The spelling of 20438885 in words is "twenty million, four hundred thirty-eight thousand, eight hundred eighty-five".