20321131111002 has 12 divisors (see below), whose sum is σ = 44029117407210. Its totient is φ = 6773710370328.

The previous prime is 20321131110977. The next prime is 20321131111003. The reversal of 20321131111002 is 20011113112302.

20321131111002 is a `hidden beast` number, since 20 + 321 + 1 + 311 + 1 + 10 + 0 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17117822242161 + 3203308868841 = 4137369^2 + 1789779^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1128951728389 = 20321131111002 / (2 + 0 + 3 + 2 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 0 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (20321131111003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 564475864177 + ... + 564475864212.

Almost surely, 2^{20321131111002} is an apocalyptic number.

20321131111002 is an abundant number, since it is smaller than the sum of its proper divisors (23707986296208).

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

20321131111002 is a wasteful number, since it uses less digits than its factorization.

20321131111002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128951728397 (or 1128951728394 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 20321131111002 its reverse (20011113112302), we get a palindrome (40332244223304).

The spelling of 20321131111002 in words is "twenty trillion, three hundred twenty-one billion, one hundred thirty-one million, one hundred eleven thousand, two".