20502225565 has 32 divisors (see below), whose sum is σ = 26034739200. Its totient is φ = 15478594560.

The previous prime is 20502225551. The next prime is 20502225571. The reversal of 20502225565 is 56552220502.

It is not a de Polignac number, because 20502225565 - 2¹¹ = 20502223517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20502225565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 996856 + ... + 1017214.

It is an arithmetic number, because the mean of its divisors is an integer number (813585600).

Almost surely, 2^20502225565 is an apocalyptic number.

It is an amenable number.

20502225565 is a deficient number, since it is larger than the sum of its proper divisors (5532513635).

20502225565 is a wasteful number, since it uses less digits than its factorization.

20502225565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20557.

The product of its (nonzero) digits is 60000, while the sum is 34.

The spelling of 20502225565 in words is "twenty billion, five hundred two million, two hundred twenty-five thousand, five hundred sixty-five".