20011550545 has 16 divisors (see below), whose sum is σ = 28637648640. Its totient is φ = 13125587904.

The previous prime is 20011550521. The next prime is 20011550549. The reversal of 20011550545 is 54505511002.

It is a cyclic number.

It is not a de Polignac number, because 20011550545 - 2¹¹ = 20011548497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20011550549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12428730 + ... + 12430339.

It is an arithmetic number, because the mean of its divisors is an integer number (1789853040).

Almost surely, 2^20011550545 is an apocalyptic number.

It is an amenable number.

20011550545 is a deficient number, since it is larger than the sum of its proper divisors (8626098095).

20011550545 is a wasteful number, since it uses less digits than its factorization.

20011550545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24859104.

The product of its (nonzero) digits is 5000, while the sum is 28.

The spelling of 20011550545 in words is "twenty billion, eleven million, five hundred fifty thousand, five hundred forty-five".