20445205136 has 20 divisors (see below), whose sum is σ = 39620714112. Its totient is φ = 10220504736.

The previous prime is 20445205133. The next prime is 20445205153. The reversal of 20445205136 is 63150254402.

It is not an unprimeable number, because it can be changed into a prime (20445205133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49160 + ... + 208103.

Almost surely, 2^20445205136 is an apocalyptic number.

It is an amenable number.

20445205136 is a deficient number, since it is larger than the sum of its proper divisors (19175508976).

20445205136 is a wasteful number, since it uses less digits than its factorization.

20445205136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262238 (or 262232 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 20445205136 its reverse (63150254402), we get a palindrome (83595459538).

The spelling of 20445205136 in words is "twenty billion, four hundred forty-five million, two hundred five thousand, one hundred thirty-six".