20021320332 has 72 divisors (see below), whose sum is σ = 54532296000. Its totient is φ = 6157036800.

The previous prime is 20021320321. The next prime is 20021320337. The reversal of 20021320332 is 23302312002.

It is a happy number.

20021320332 is a `hidden beast` number, since 200 + 2 + 132 + 0 + 332 = 666.

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 (20021320337) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 924832 + ... + 946232.

It is an arithmetic number, because the mean of its divisors is an integer number (757393000).

Almost surely, 2^20021320332 is an apocalyptic number.

It is an amenable number.

20021320332 is an abundant number, since it is smaller than the sum of its proper divisors (34510975668).

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

20021320332 is a wasteful number, since it uses less digits than its factorization.

20021320332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23423 (or 23418 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 20021320332 its reverse (23302312002), we get a palindrome (43323632334).

The spelling of 20021320332 in words is "twenty billion, twenty-one million, three hundred twenty thousand, three hundred thirty-two".