2005604031 has 4 divisors (see below), whose sum is σ = 2674138712. Its totient is φ = 1337069352.

The previous prime is 2005604021. The next prime is 2005604039. The reversal of 2005604031 is 1304065002.

It is a happy number.

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

It is not a de Polignac number, because 2005604031 - 2²² = 2001409727 is a prime.

It is a super-2 number, since 2×2005604031² = 8044895058326897922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2005603989 and 2005604007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005604039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334267336 + ... + 334267341.

It is an arithmetic number, because the mean of its divisors is an integer number (668534678).

Almost surely, 2^2005604031 is an apocalyptic number.

2005604031 is a deficient number, since it is larger than the sum of its proper divisors (668534681).

2005604031 is an equidigital number, since it uses as much as digits as its factorization.

2005604031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668534680.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 2005604031 is about 44783.9706926485. The cubic root of 2005604031 is about 1261.0967252610.

Adding to 2005604031 its reverse (1304065002), we get a palindrome (3309669033).

The spelling of 2005604031 in words is "two billion, five million, six hundred four thousand, thirty-one".