20888930545 has 24 divisors (see below), whose sum is σ = 29709434664. Its totient is φ = 14053568256.

The previous prime is 20888930507. The next prime is 20888930599. The reversal of 20888930545 is 54503988802.

It can be written as a sum of positive squares in 4 ways, for example, as 350887824 + 20538042721 = 18732^2 + 143311^2 .

It is not a de Polignac number, because 20888930545 - 2¹¹ = 20888928497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20888930492 and 20888930501.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 791364 + ... + 817333.

It is an arithmetic number, because the mean of its divisors is an integer number (1237893111).

Almost surely, 2^20888930545 is an apocalyptic number.

It is an amenable number.

20888930545 is a deficient number, since it is larger than the sum of its proper divisors (8820504119).

20888930545 is a wasteful number, since it uses less digits than its factorization.

20888930545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608769 (or 1608762 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 20888930545 in words is "twenty billion, eight hundred eighty-eight million, nine hundred thirty thousand, five hundred forty-five".