2005431320 has 16 divisors (see below), whose sum is σ = 4512220560. Its totient is φ = 802172512.

The previous prime is 2005431293. The next prime is 2005431347. The reversal of 2005431320 is 231345002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2005431293) and next prime (2005431347).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2005431292 and 2005431301.

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, 25067852 + ... + 25067931.

It is an arithmetic number, because the mean of its divisors is an integer number (282013785).

Almost surely, 2^2005431320 is an apocalyptic number.

2005431320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2005431320 is an abundant number, since it is smaller than the sum of its proper divisors (2506789240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2005431320 is a wasteful number, since it uses less digits than its factorization.

2005431320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50135794 (or 50135790 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 2005431320 is about 44782.0423830803. The cubic root of 2005431320 is about 1261.0605247738.

Adding to 2005431320 its reverse (231345002), we get a palindrome (2236776322).

The spelling of 2005431320 in words is "two billion, five million, four hundred thirty-one thousand, three hundred twenty".