20351552 has 56 divisors (see below), whose sum is σ = 44314872. Its totient is φ = 9216000.

The previous prime is 20351537. The next prime is 20351579. The reversal of 20351552 is 25515302.

It can be written as a sum of positive squares in 4 ways, for example, as 1132096 + 19219456 = 1064^2 + 4384^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50552 + ... + 50952.

It is an arithmetic number, because the mean of its divisors is an integer number (791337).

Almost surely, 2^20351552 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 20351552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22157436).

20351552 is an abundant number, since it is smaller than the sum of its proper divisors (23963320).

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

20351552 is a wasteful number, since it uses less digits than its factorization.

20351552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 477 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 20351552 is about 4511.2694444025. The cubic root of 20351552 is about 273.0229645197.

Adding to 20351552 its reverse (25515302), we get a palindrome (45866854).

The spelling of 20351552 in words is "twenty million, three hundred fifty-one thousand, five hundred fifty-two".