20131343245 has 16 divisors (see below), whose sum is σ = 26506760112. Its totient is φ = 14585725440.

The previous prime is 20131343233. The next prime is 20131343299. The reversal of 20131343245 is 54234313102.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 52736644 + 20078606601 = 7262^2 + 141699^2 .

It is not a de Polignac number, because 20131343245 - 2⁷ = 20131343117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2918376 + ... + 2925265.

It is an arithmetic number, because the mean of its divisors is an integer number (1656672507).

Almost surely, 2^20131343245 is an apocalyptic number.

It is an amenable number.

20131343245 is a deficient number, since it is larger than the sum of its proper divisors (6375416867).

20131343245 is a wasteful number, since it uses less digits than its factorization.

20131343245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5843712.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 20131343245 its reverse (54234313102), we get a palindrome (74365656347).

The spelling of 20131343245 in words is "twenty billion, one hundred thirty-one million, three hundred forty-three thousand, two hundred forty-five".