20445593 has 12 divisors (see below), whose sum is σ = 24366132. Its totient is φ = 17095680.

The previous prime is 20445589. The next prime is 20445599. The reversal of 20445593 is 39554402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6210064 + 14235529 = 2492^2 + 3773^2 .

It is not a de Polignac number, because 20445593 - 2² = 20445589 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20445599) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3080 + ... + 7097.

It is an arithmetic number, because the mean of its divisors is an integer number (2030511).

Almost surely, 2^20445593 is an apocalyptic number.

It is an amenable number.

20445593 is a deficient number, since it is larger than the sum of its proper divisors (3920539).

20445593 is a wasteful number, since it uses less digits than its factorization.

20445593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10232 (or 10225 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 20445593 is about 4521.6803292581. The cubic root of 20445593 is about 273.4428490687.

Adding to 20445593 its reverse (39554402), we get a palindrome (59999995).

The spelling of 20445593 in words is "twenty million, four hundred forty-five thousand, five hundred ninety-three".