20131544545 has 32 divisors (see below), whose sum is σ = 28217548800. Its totient is φ = 13500643776.

The previous prime is 20131544527. The next prime is 20131544549. The reversal of 20131544545 is 54544513102.

It is a cyclic number.

It is not a de Polignac number, because 20131544545 - 2⁹ = 20131544033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20131544545.

It is not an unprimeable number, because it can be changed into a prime (20131544549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2659476 + ... + 2667034.

It is an arithmetic number, because the mean of its divisors is an integer number (881798400).

Almost surely, 2^20131544545 is an apocalyptic number.

It is an amenable number.

20131544545 is a deficient number, since it is larger than the sum of its proper divisors (8086004255).

20131544545 is a wasteful number, since it uses less digits than its factorization.

20131544545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9237.

The product of its (nonzero) digits is 48000, while the sum is 34.

The spelling of 20131544545 in words is "twenty billion, one hundred thirty-one million, five hundred forty-four thousand, five hundred forty-five".