20321220132 has 18 divisors (see below), whose sum is σ = 51367528758. Its totient is φ = 6773740032.

The previous prime is 20321220077. The next prime is 20321220133. The reversal of 20321220132 is 23102212302.

It can be written as a sum of positive squares in only one way, i.e., 11514148416 + 8807071716 = 107304^2 + 93846^2 .

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 not an unprimeable number, because it can be changed into a prime (20321220133) 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, 282239133 + ... + 282239204.

Almost surely, 2^20321220132 is an apocalyptic number.

It is an amenable number.

20321220132 is an abundant number, since it is smaller than the sum of its proper divisors (31046308626).

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

20321220132 is a wasteful number, since it uses less digits than its factorization.

20321220132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564478347 (or 564478342 counting only the distinct ones).

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

Adding to 20321220132 its reverse (23102212302), we get a palindrome (43423432434).

The spelling of 20321220132 in words is "twenty billion, three hundred twenty-one million, two hundred twenty thousand, one hundred thirty-two".