20205403245 has 24 divisors (see below), whose sum is σ = 35046180000. Its totient is φ = 10768990176.

The previous prime is 20205403243. The next prime is 20205403271. The reversal of 20205403245 is 54230450202.

It is a happy number.

It is not a de Polignac number, because 20205403245 - 2¹ = 20205403243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205403241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82315 + ... + 217224.

It is an arithmetic number, because the mean of its divisors is an integer number (1460257500).

Almost surely, 2^20205403245 is an apocalyptic number.

It is an amenable number.

20205403245 is a deficient number, since it is larger than the sum of its proper divisors (14840776755).

20205403245 is a wasteful number, since it uses less digits than its factorization.

20205403245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301049 (or 301046 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

Adding to 20205403245 its reverse (54230450202), we get a palindrome (74435853447).

The spelling of 20205403245 in words is "twenty billion, two hundred five million, four hundred three thousand, two hundred forty-five".