20145232055545 has 4 divisors (see below), whose sum is σ = 24174278466660. Its totient is φ = 16116185644432.

The previous prime is 20145232055471. The next prime is 20145232055561. The reversal of 20145232055545 is 54555023254102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7274731403241 + 12870500652304 = 2697171^2 + 3587548^2 .

It is a cyclic number.

It is not a de Polignac number, because 20145232055545 - 2¹¹ = 20145232053497 is a prime.

It is a super-3 number, since 3×20145232055545³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2014523205550 + ... + 2014523205559.

It is an arithmetic number, because the mean of its divisors is an integer number (6043569616665).

Almost surely, 2^{20145232055545} is an apocalyptic number.

It is an amenable number.

20145232055545 is a deficient number, since it is larger than the sum of its proper divisors (4029046411115).

20145232055545 is an equidigital number, since it uses as much as digits as its factorization.

20145232055545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4029046411114.

The product of its (nonzero) digits is 1200000, while the sum is 43.

The spelling of 20145232055545 in words is "twenty trillion, one hundred forty-five billion, two hundred thirty-two million, fifty-five thousand, five hundred forty-five".