20001220012331 has 4 divisors (see below), whose sum is σ = 20003873757432. Its totient is φ = 19998566267232.

The previous prime is 20001220012309. The next prime is 20001220012343. The reversal of 20001220012331 is 13321002210002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001220012331 is a prime.

It is a super-2 number, since 2×20001220012331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001220012381) 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, 1326861245 + ... + 1326876318.

It is an arithmetic number, because the mean of its divisors is an integer number (5000968439358).

Almost surely, 2^{20001220012331} is an apocalyptic number.

20001220012331 is a deficient number, since it is larger than the sum of its proper divisors (2653745101).

20001220012331 is an equidigital number, since it uses as much as digits as its factorization.

20001220012331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2653745100.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20001220012331 its reverse (13321002210002), we get a palindrome (33322222222333).

The spelling of 20001220012331 in words is "twenty trillion, one billion, two hundred twenty million, twelve thousand, three hundred thirty-one".