20438005 has 16 divisors (see below), whose sum is σ = 28157184. Its totient is φ = 13950720.

The previous prime is 20437999. The next prime is 20438009. The reversal of 20438005 is 50083402.

It is not a de Polignac number, because 20438005 - 2¹³ = 20429813 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 (20438009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7224 + ... + 9646.

It is an arithmetic number, because the mean of its divisors is an integer number (1759824).

Almost surely, 2^20438005 is an apocalyptic number.

It is an amenable number.

20438005 is a deficient number, since it is larger than the sum of its proper divisors (7719179).

20438005 is a wasteful number, since it uses less digits than its factorization.

20438005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2676.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20438005 is about 4520.8411827889. The cubic root of 20438005 is about 273.4090171474.

The spelling of 20438005 in words is "twenty million, four hundred thirty-eight thousand, five".