20131140256 has 12 divisors (see below), whose sum is σ = 39633182442. Its totient is φ = 10065570112.

The previous prime is 20131140247. The next prime is 20131140259. The reversal of 20131140256 is 65204113102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19131315856 + 999824400 = 138316^2 + 31620^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20131140256.

It is not an unprimeable number, because it can be changed into a prime (20131140259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314549035 + ... + 314549098.

Almost surely, 2^20131140256 is an apocalyptic number.

It is an amenable number.

20131140256 is a deficient number, since it is larger than the sum of its proper divisors (19502042186).

20131140256 is an equidigital number, since it uses as much as digits as its factorization.

20131140256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629098143 (or 629098135 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 20131140256 its reverse (65204113102), we get a palindrome (85335253358).

The spelling of 20131140256 in words is "twenty billion, one hundred thirty-one million, one hundred forty thousand, two hundred fifty-six".