20245340505 has 32 divisors (see below), whose sum is σ = 35827110144. Its totient is φ = 9697556736.

The previous prime is 20245340497. The next prime is 20245340561. The reversal of 20245340505 is 50504354202.

It is not a de Polignac number, because 20245340505 - 2³ = 20245340497 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1395789 + ... + 1410218.

It is an arithmetic number, because the mean of its divisors is an integer number (1119597192).

Almost surely, 2^20245340505 is an apocalyptic number.

It is an amenable number.

20245340505 is a deficient number, since it is larger than the sum of its proper divisors (15581769639).

20245340505 is a wasteful number, since it uses less digits than its factorization.

20245340505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2806065.

The product of its (nonzero) digits is 24000, while the sum is 30.

Adding to 20245340505 its reverse (50504354202), we get a palindrome (70749694707).

The spelling of 20245340505 in words is "twenty billion, two hundred forty-five million, three hundred forty thousand, five hundred five".