20331010013 has 4 divisors (see below), whose sum is σ = 20826888348. Its totient is φ = 19835131680.

The previous prime is 20331009949. The next prime is 20331010031. The reversal of 20331010013 is 31001013302.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9389222404 + 10941787609 = 96898^2 + 104603^2 .

It is a cyclic number.

It is not a de Polignac number, because 20331010013 - 2⁶ = 20331009949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20331010013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331010033) 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, 247939106 + ... + 247939187.

It is an arithmetic number, because the mean of its divisors is an integer number (5206722087).

Almost surely, 2^20331010013 is an apocalyptic number.

It is an amenable number.

20331010013 is a deficient number, since it is larger than the sum of its proper divisors (495878335).

20331010013 is an equidigital number, since it uses as much as digits as its factorization.

20331010013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495878334.

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 20331010013 its reverse (31001013302), we get a palindrome (51332023315).

The spelling of 20331010013 in words is "twenty billion, three hundred thirty-one million, ten thousand, thirteen".