20125590 has 16 divisors (see below), whose sum is σ = 48301488. Its totient is φ = 5366816.

The previous prime is 20125583. The next prime is 20125601. The reversal of 20125590 is 9552102.

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 20125590.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 335397 + ... + 335456.

It is an arithmetic number, because the mean of its divisors is an integer number (3018843).

Almost surely, 2^20125590 is an apocalyptic number.

20125590 is an abundant number, since it is smaller than the sum of its proper divisors (28175898).

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

20125590 is a wasteful number, since it uses less digits than its factorization.

20125590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670863.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 20125590 is about 4486.1553695787. The cubic root of 20125590 is about 272.0087493581.

Adding to 20125590 its reverse (9552102), we get a palindrome (29677692).

The spelling of 20125590 in words is "twenty million, one hundred twenty-five thousand, five hundred ninety".