20625090 has 64 divisors (see below), whose sum is σ = 51874560. Its totient is φ = 5241600.

The previous prime is 20625071. The next prime is 20625103. The reversal of 20625090 is 9052602.

It is a self number, because there is not a number n which added to its sum of digits gives 20625090.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 131292 + ... + 131448.

It is an arithmetic number, because the mean of its divisors is an integer number (810540).

Almost surely, 2^20625090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20625090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25937280).

20625090 is an abundant number, since it is smaller than the sum of its proper divisors (31249470).

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

20625090 is a wasteful number, since it uses less digits than its factorization.

20625090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20625090 is about 4541.4854398093. The cubic root of 20625090 is about 274.2407265161.

Adding to 20625090 its reverse (9052602), we get a palindrome (29677692).

The spelling of 20625090 in words is "twenty million, six hundred twenty-five thousand, ninety".