20530523545 has 16 divisors (see below), whose sum is σ = 28280193408. Its totient is φ = 14016049920.

The previous prime is 20530523437. The next prime is 20530523561. The reversal of 20530523545 is 54532503502.

It is not a de Polignac number, because 20530523545 - 2¹³ = 20530515353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20530523545.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1284096 + ... + 1299985.

It is an arithmetic number, because the mean of its divisors is an integer number (1767512088).

Almost surely, 2^20530523545 is an apocalyptic number.

It is an amenable number.

20530523545 is a deficient number, since it is larger than the sum of its proper divisors (7749669863).

20530523545 is a wasteful number, since it uses less digits than its factorization.

20530523545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2584320.

The product of its (nonzero) digits is 90000, while the sum is 34.

The spelling of 20530523545 in words is "twenty billion, five hundred thirty million, five hundred twenty-three thousand, five hundred forty-five".