20312220312 has 112 divisors (see below), whose sum is σ = 57301705440. Its totient is φ = 6747064128.

The previous prime is 20312220311. The next prime is 20312220319. The reversal of 20312220312 is 21302221302.

20312220312 is a `hidden beast` number, since 20 + 312 + 2 + 20 + 312 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312220311) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1702833 + ... + 1714719.

It is an arithmetic number, because the mean of its divisors is an integer number (511622370).

Almost surely, 2^20312220312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20312220312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28650852720).

20312220312 is an abundant number, since it is smaller than the sum of its proper divisors (36989485128).

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

20312220312 is a wasteful number, since it uses less digits than its factorization.

20312220312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12204 (or 12185 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20312220312 its reverse (21302221302), we get a palindrome (41614441614).

The spelling of 20312220312 in words is "twenty billion, three hundred twelve million, two hundred twenty thousand, three hundred twelve".