20502125505 has 48 divisors (see below), whose sum is σ = 36784547280. Its totient is φ = 10551066624.

The previous prime is 20502125489. The next prime is 20502125513. The reversal of 20502125505 is 50552120502.

It can be written as a sum of positive squares in 8 ways, for example, as 3040088769 + 17462036736 = 55137^2 + 132144^2 .

It is not a de Polignac number, because 20502125505 - 2⁴ = 20502125489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2806017 + ... + 2813313.

It is an arithmetic number, because the mean of its divisors is an integer number (766344735).

Almost surely, 2^20502125505 is an apocalyptic number.

It is an amenable number.

20502125505 is a deficient number, since it is larger than the sum of its proper divisors (16282421775).

20502125505 is a wasteful number, since it uses less digits than its factorization.

20502125505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9490 (or 9487 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The spelling of 20502125505 in words is "twenty billion, five hundred two million, one hundred twenty-five thousand, five hundred five".