12311220020 has 36 divisors (see below), whose sum is σ = 28417557252. Its totient is φ = 4476806400.

The previous prime is 12311220013. The next prime is 12311220023. The reversal of 12311220020 is 2002211321.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4717491856 + 7593728164 = 68684^2 + 87142^2 .

It is a super-2 number, since 2×12311220020² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12311219977 and 12311220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311220023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2541221 + ... + 2546060.

Almost surely, 2^12311220020 is an apocalyptic number.

12311220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12311220020 is an abundant number, since it is smaller than the sum of its proper divisors (16106337232).

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

12311220020 is a wasteful number, since it uses less digits than its factorization.

12311220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5087312 (or 5087299 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 12311220020 its reverse (2002211321), we get a palindrome (14313431341).

The spelling of 12311220020 in words is "twelve billion, three hundred eleven million, two hundred twenty thousand, twenty".