20013021312 has 64 divisors (see below), whose sum is σ = 53756978400. Its totient is φ = 6596040704.

The previous prime is 20013021293. The next prime is 20013021313. The reversal of 20013021312 is 21312031002.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 20013021291 and 20013021300.

It is not an unprimeable number, because it can be changed into a prime (20013021313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258618 + ... + 326969.

Almost surely, 2^20013021312 is an apocalyptic number.

It is an amenable number.

20013021312 is an abundant number, since it is smaller than the sum of its proper divisors (33743957088).

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

20013021312 is an equidigital number, since it uses as much as digits as its factorization.

20013021312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585693 (or 585681 counting only the distinct ones).

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

Adding to 20013021312 its reverse (21312031002), we get a palindrome (41325052314).

The spelling of 20013021312 in words is "twenty billion, thirteen million, twenty-one thousand, three hundred twelve".