20325516 has 48 divisors (see below), whose sum is σ = 50265600. Its totient is φ = 6374592.

The previous prime is 20325511. The next prime is 20325517. The reversal of 20325516 is 61552302.

It is not an unprimeable number, because it can be changed into a prime (20325511) 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, 54306 + ... + 54678.

It is an arithmetic number, because the mean of its divisors is an integer number (1047200).

Almost surely, 2^20325516 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 20325516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25132800).

20325516 is an abundant number, since it is smaller than the sum of its proper divisors (29940084).

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

20325516 is a wasteful number, since it uses less digits than its factorization.

20325516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 20325516 is about 4508.3828586312. The cubic root of 20325516 is about 272.9064875821.

Adding to 20325516 its reverse (61552302), we get a palindrome (81877818).

The spelling of 20325516 in words is "twenty million, three hundred twenty-five thousand, five hundred sixteen".