20011321332 has 18 divisors (see below), whose sum is σ = 50584173458. Its totient is φ = 6670440432.

The previous prime is 20011321321. The next prime is 20011321339. The reversal of 20011321332 is 23312311002.

20011321332 is a `hidden beast` number, since 2 + 0 + 0 + 11 + 321 + 332 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19904695056 + 106626276 = 141084^2 + 10326^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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 (20011321339) 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, 277934983 + ... + 277935054.

Almost surely, 2^20011321332 is an apocalyptic number.

It is an amenable number.

20011321332 is an abundant number, since it is smaller than the sum of its proper divisors (30572852126).

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

20011321332 is a wasteful number, since it uses less digits than its factorization.

20011321332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555870047 (or 555870042 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 20011321332 its reverse (23312311002), we get a palindrome (43323632334).

It can be divided in two parts, 200113 and 21332, that added together give a triangular number (221445 = T₆₆₅).

The spelling of 20011321332 in words is "twenty billion, eleven million, three hundred twenty-one thousand, three hundred thirty-two".