20021105312 has 96 divisors (see below), whose sum is σ = 43985410560. Its totient is φ = 8911918080.

The previous prime is 20021105311. The next prime is 20021105323. The reversal of 20021105312 is 21350112002.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20021105311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1293137 + ... + 1308527.

It is an arithmetic number, because the mean of its divisors is an integer number (458181360).

Almost surely, 2^20021105312 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 20021105312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21992705280).

20021105312 is an abundant number, since it is smaller than the sum of its proper divisors (23964305248).

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

20021105312 is a wasteful number, since it uses less digits than its factorization.

20021105312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15526 (or 15518 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 20021105312 its reverse (21350112002), we get a palindrome (41371217314).

The spelling of 20021105312 in words is "twenty billion, twenty-one million, one hundred five thousand, three hundred twelve".