20508450 has 48 divisors (see below), whose sum is σ = 51960960. Its totient is φ = 5350720.

The previous prime is 20508431. The next prime is 20508451. The reversal of 20508450 is 5480502.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20508450.

It is not an unprimeable number, because it can be changed into a prime (20508451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5596 + ... + 8504.

It is an arithmetic number, because the mean of its divisors is an integer number (1082520).

Almost surely, 2^20508450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20508450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25980480).

20508450 is an abundant number, since it is smaller than the sum of its proper divisors (31452510).

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

20508450 is a wasteful number, since it uses less digits than its factorization.

20508450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2971 (or 2966 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 20508450 is about 4528.6256193243. The cubic root of 20508450 is about 273.7227824736.

Adding to 20508450 its reverse (5480502), we get a palindrome (25988952).

The spelling of 20508450 in words is "twenty million, five hundred eight thousand, four hundred fifty".