20120120331 has 4 divisors (see below), whose sum is σ = 26826827112. Its totient is φ = 13413413552.

The previous prime is 20120120327. The next prime is 20120120341. The reversal of 20120120331 is 13302102102.

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

It is a cyclic number.

It is not a de Polignac number, because 20120120331 - 2² = 20120120327 is a prime.

It is a super-2 number, since 2×20120120331² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20120120331.

It is not an unprimeable number, because it can be changed into a prime (20120120311) 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, 3353353386 + ... + 3353353391.

It is an arithmetic number, because the mean of its divisors is an integer number (6706706778).

Almost surely, 2^20120120331 is an apocalyptic number.

20120120331 is a deficient number, since it is larger than the sum of its proper divisors (6706706781).

20120120331 is an equidigital number, since it uses as much as digits as its factorization.

20120120331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6706706780.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20120120331 its reverse (13302102102), we get a palindrome (33422222433).

The spelling of 20120120331 in words is "twenty billion, one hundred twenty million, one hundred twenty thousand, three hundred thirty-one".