20162005 has 4 divisors (see below), whose sum is σ = 24194412. Its totient is φ = 16129600.

The previous prime is 20161993. The next prime is 20162027. The reversal of 20162005 is 50026102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10712529 + 9449476 = 3273^2 + 3074^2 .

It is not a de Polignac number, because 20162005 - 2⁷ = 20161877 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20162005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2016196 + ... + 2016205.

It is an arithmetic number, because the mean of its divisors is an integer number (6048603).

Almost surely, 2^20162005 is an apocalyptic number.

It is an amenable number.

20162005 is a deficient number, since it is larger than the sum of its proper divisors (4032407).

20162005 is an equidigital number, since it uses as much as digits as its factorization.

20162005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4032406.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20162005 is about 4490.2121330734. The cubic root of 20162005 is about 272.1727069612.

Adding to 20162005 its reverse (50026102), we get a palindrome (70188107).

The spelling of 20162005 in words is "twenty million, one hundred sixty-two thousand, five".