20021332312 has 8 divisors (see below), whose sum is σ = 37539998100. Its totient is φ = 10010666152.

The previous prime is 20021332273. The next prime is 20021332319. The reversal of 20021332312 is 21323312002.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 20021332312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021332319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1251333262 + ... + 1251333277.

Almost surely, 2^20021332312 is an apocalyptic number.

It is an amenable number.

20021332312 is a deficient number, since it is larger than the sum of its proper divisors (17518665788).

20021332312 is a wasteful number, since it uses less digits than its factorization.

20021332312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2502666545 (or 2502666541 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 20021332312 its reverse (21323312002), we get a palindrome (41344644314).

The spelling of 20021332312 in words is "twenty billion, twenty-one million, three hundred thirty-two thousand, three hundred twelve".