20031323240 has 16 divisors (see below), whose sum is σ = 45070477380. Its totient is φ = 8012529280.

The previous prime is 20031323203. The next prime is 20031323251. The reversal of 20031323240 is 4232313002.

It can be written as a sum of positive squares in 2 ways, for example, as 17010941476 + 3020381764 = 130426^2 + 54958^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250391501 + ... + 250391580.

Almost surely, 2^20031323240 is an apocalyptic number.

20031323240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20031323240 is an abundant number, since it is smaller than the sum of its proper divisors (25039154140).

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

20031323240 is a wasteful number, since it uses less digits than its factorization.

20031323240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500783092 (or 500783088 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 20031323240 its reverse (4232313002), we get a palindrome (24263636242).

The spelling of 20031323240 in words is "twenty billion, thirty-one million, three hundred twenty-three thousand, two hundred forty".