20021332 has 12 divisors (see below), whose sum is σ = 35069076. Its totient is φ = 10001600.

The previous prime is 20021327. The next prime is 20021341. The reversal of 20021332 is 23312002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2414916 + 17606416 = 1554^2 + 4196^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6288 + ... + 8920.

It is an arithmetic number, because the mean of its divisors is an integer number (2922423).

Almost surely, 2^20021332 is an apocalyptic number.

It is an amenable number.

20021332 is a deficient number, since it is larger than the sum of its proper divisors (15047744).

20021332 is a wasteful number, since it uses less digits than its factorization.

20021332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4538 (or 4536 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 20021332 is about 4474.5203094857. The cubic root of 20021332 is about 271.5382339628.

Adding to 20021332 its reverse (23312002), we get a palindrome (43333334).

The spelling of 20021332 in words is "twenty million, twenty-one thousand, three hundred thirty-two".