20015544545 has 4 divisors (see below), whose sum is σ = 24018653460. Its totient is φ = 16012435632.

The previous prime is 20015544469. The next prime is 20015544589. The reversal of 20015544545 is 54544551002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54544551002 = 2 ⋅27272275501.

It can be written as a sum of positive squares in 2 ways, for example, as 15427378849 + 4588165696 = 124207^2 + 67736^2 .

It is a cyclic number.

It is not a de Polignac number, because 20015544545 - 2¹⁴ = 20015528161 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2001554450 + ... + 2001554459.

It is an arithmetic number, because the mean of its divisors is an integer number (6004663365).

Almost surely, 2^20015544545 is an apocalyptic number.

It is an amenable number.

20015544545 is a deficient number, since it is larger than the sum of its proper divisors (4003108915).

20015544545 is an equidigital number, since it uses as much as digits as its factorization.

20015544545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4003108914.

The product of its (nonzero) digits is 80000, while the sum is 35.

The spelling of 20015544545 in words is "twenty billion, fifteen million, five hundred forty-four thousand, five hundred forty-five".