20331552 has 96 divisors (see below), whose sum is σ = 56548800. Its totient is φ = 6386688.

The previous prime is 20331551. The next prime is 20331559. The reversal of 20331552 is 25513302.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (20331551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186474 + ... + 186582.

It is an arithmetic number, because the mean of its divisors is an integer number (589050).

Almost surely, 2^20331552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20331552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28274400).

20331552 is an abundant number, since it is smaller than the sum of its proper divisors (36217248).

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

20331552 is a wasteful number, since it uses less digits than its factorization.

20331552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 20331552 is about 4509.0522285731. The cubic root of 20331552 is about 272.9334996150.

Adding to 20331552 its reverse (25513302), we get a palindrome (45844854).

The spelling of 20331552 in words is "twenty million, three hundred thirty-one thousand, five hundred fifty-two".