20245012505 has 12 divisors (see below), whose sum is σ = 25396204260. Its totient is φ = 15491833632.

The previous prime is 20245012481. The next prime is 20245012519. The reversal of 20245012505 is 50521054202.

It can be written as a sum of positive squares in 2 ways, for example, as 11077141504 + 9167871001 = 105248^2 + 95749^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20245012505 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3824390 + ... + 3829679.

It is an arithmetic number, because the mean of its divisors is an integer number (2116350355).

Almost surely, 2^20245012505 is an apocalyptic number.

It is an amenable number.

20245012505 is a deficient number, since it is larger than the sum of its proper divisors (5151191755).

20245012505 is an equidigital number, since it uses as much as digits as its factorization.

20245012505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7654120 (or 7654097 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

Adding to 20245012505 its reverse (50521054202), we get a palindrome (70766066707).

The spelling of 20245012505 in words is "twenty billion, two hundred forty-five million, twelve thousand, five hundred five".