20312005 has 8 divisors (see below), whose sum is σ = 27856512. Its totient is φ = 13928208.

The previous prime is 20311981. The next prime is 20312021. The reversal of 20312005 is 50021302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20312005 - 2⁷ = 20311877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290137 + ... + 290206.

It is an arithmetic number, because the mean of its divisors is an integer number (3482064).

Almost surely, 2^20312005 is an apocalyptic number.

It is an amenable number.

20312005 is a deficient number, since it is larger than the sum of its proper divisors (7544507).

20312005 is an equidigital number, since it uses as much as digits as its factorization.

20312005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580355.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 20312005 is about 4506.8841786760. The cubic root of 20312005 is about 272.8460043802.

Adding to 20312005 its reverse (50021302), we get a palindrome (70333307).

The spelling of 20312005 in words is "twenty million, three hundred twelve thousand, five".