20005555545 has 48 divisors (see below), whose sum is σ = 36739422720. Its totient is φ = 10035620352.

The previous prime is 20005555541. The next prime is 20005555607. The reversal of 20005555545 is 54555550002.

It is not a de Polignac number, because 20005555545 - 2² = 20005555541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20005555541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1338202 + ... + 1353068.

It is an arithmetic number, because the mean of its divisors is an integer number (765404640).

Almost surely, 2^20005555545 is an apocalyptic number.

It is an amenable number.

20005555545 is a deficient number, since it is larger than the sum of its proper divisors (16733867175).

20005555545 is a wasteful number, since it uses less digits than its factorization.

20005555545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16654 (or 16651 counting only the distinct ones).

The product of its (nonzero) digits is 125000, while the sum is 36.

The spelling of 20005555545 in words is "twenty billion, five million, five hundred fifty-five thousand, five hundred forty-five".